View source for Exploration of Mars

{{Short description|none}} <!-- "none" is preferred when the title is sufficiently descriptive; see [[WP:SDNONE]] -->
{{Distinguish|Human mission to Mars|Colonization of Mars}}
[[File:Mars 2020 selfie containing both perseverance rover and ingenuity.gif|thumb|upright=1.4|{{longitem|[[Self-portrait]] of [[Perseverance rover|''Perseverance'' rover]] and [[Ingenuity helicopter|''Ingenuity'' helicopter]] (to the left) located at Wright Brothers Field, the ''Ingenuity'' helicopter drop site (7 April 2021)|style=padding: 3px 0; line-height: 1.3em;}}]]
{{Bar chart
| title = Active Mars missions, 1997 to present{{ref|active|α}}
| float = right
| label_type = Year
| data_type = Number of missions
| data_max = 11

| label1 = 1997
| data1 = 2 <!-- MPF MGS -->
| label2 = 1998
| data2 = 1 <!-- MGS -->
| label3 = 1999
| data3 = 1 <!-- MGS -->
| label4 = 2000
| data4 = 1 <!-- MGS -->
| label5 = 2001
| data5 = 2 <!-- MGS 2001MO -->
| label6 = 2002
| data6 = 2 <!-- MGS 2001MO -->
| label7 = 2003
| data7 = 3 <!-- MGS 2001MO ME -->
| label8 = 2004
| data8 = 5 <!-- MGS 2001MO ME MER1 MER2 -->
| label9 = 2005
| data9 = 5 <!-- MGS 2001MO ME MER1 MER2 -->
| label10 = 2006
| data10 = 6 <!-- MGS 2001MO ME MER1 MER2 MRO -->
| label11 = 2007
| data11 = 5 <!-- 2001MO ME MER1 MER2 MRO -->
| label12 = 2008
| data12 = 6 <!-- 2001MO ME MER1 MER2 MRO PHX-->
| label13 = 2009
| data13 = 5 <!-- 2001MO ME MER1 MER2 MRO -->
| label14 = 2010
| data14 = 5 <!-- 2001MO ME MER1 MER2 MRO -->
| label15 = 2011
| data15 = 4 <!-- 2001MO ME MER1 MRO -->
| label16 = 2012
| data16 = 5 <!-- 2001MO ME MER1 MRO MSL -->
| label17 = 2013
| data17 = 5 <!-- 2001MO ME MER1 MRO MSL -->
| label18 = 2014
| data18 = 7 <!-- 2001MO ME MER1 MRO MSL MAVEN MOM -->
| label19 = 2015
| data19 = 7 <!-- 2001MO ME MER1 MRO MSL MAVEN MOM -->
| label20 = 2016
| data20 = 8 <!-- 2001MO ME MER1 MRO MSL MAVEN MOM TGO -->
| label21 = 2017
| data21 = 8 <!-- 2001MO ME MER1 MRO MSL MAVEN MOM TGO -->
| label22 = 2018
| data22 = 9 <!-- 2001MO ME MER1 MRO MSL MAVEN MOM TGO INS-->
| label23 = 2019
| data23 = 8 <!-- 2001MO ME MRO MSL MAVEN MOM TGO INS-->
| label24 = 2020
| data24 = 8 <!-- 2001MO ME MRO MSL MAVEN MOM TGO INS-->
| label25 = 2021
| data25 = 11 <!-- 2001MO ME MRO MSL MAVEN MOM TGO INS HOP TIA M2020-->
| label26 = 2022
| data26 = 11 <!-- 2001MO ME MRO MSL MAVEN MOM TGO INS HOP TIA M2020-->
| label27 = 2023
| data27 = 10 <!-- 2001MO ME MRO MSL MAVEN MOM TGO INS HOP M2020-->
}}

The planet [[Mars]] has been explored remotely by spacecraft. [[Uncrewed spacecraft |Probes]] sent from Earth, beginning in the late 20th century, have yielded a large increase in knowledge about the Martian system, focused primarily on understanding [[Geology of Mars|its geology]] and [[Planetary habitability|habitability]] potential.<ref name="SCI-20140124a">{{cite journal |last=Grotzinger |first=John P. |title=Introduction to Special Issue – Habitability, Taphonomy and the Search for Organic Carbon on Mars |journal=[[Science (journal)|Science]] |date=24 January 2014 |volume=343 |number=6169 |pages=386–387 |doi=10.1126/science.1249944 |bibcode=2014Sci...343..386G |pmid=24458635|doi-access=free }}</ref><ref>{{Cite journal|last1=Changela|first1=Hitesh G.|last2=Chatzitheodoridis|first2=Elias|last3=Antunes|first3=Andre|last4=Beaty|first4=David|last5=Bouw|first5=Kristian|last6=Bridges|first6=John C.|last7=Capova|first7=Klara Anna|last8=Cockell|first8=Charles S.|last9=Conley|first9=Catharine A.|last10=Dadachova|first10=Ekaterina|last11=Dallas|first11=Tiffany D.|date=1 December 2021|title=Mars: new insights and unresolved questions|url=https://www.cambridge.org/core/journals/international-journal-of-astrobiology/article/mars-new-insights-and-unresolved-questions/F0E43D7EC62EA126262CB66DF069ABA0|journal=International Journal of Astrobiology|language=en|volume=20|issue=6|pages=394–426|doi=10.1017/S1473550421000276|arxiv=2112.00596|bibcode=2021IJAsB..20..394C|s2cid=244773061|issn=1473-5504}}</ref> Engineering [[Interplanetary spaceflight|interplanetary journeys]] is complicated and the '''exploration of Mars''' has experienced a high failure rate, especially the early attempts. Roughly sixty percent of all spacecraft destined for Mars failed before completing their missions, with some failing before their observations could begin. Some missions have been met with unexpected success, such as the twin [[Mars Exploration Rover]]s, ''[[Spirit (rover)|Spirit]]'' and ''[[Opportunity (rover)|Opportunity]]'', which operated for years beyond their specification.<ref>{{Cite web|url=http://science.nationalgeographic.com/science/space/space-exploration/mars-exploration-article/|title=Mars Exploration, Mars Rovers Information, Facts, News, Photos – National Geographic|last=Society|first=National Geographic|website=National Geographic|access-date=2016-03-04|date=2009-10-15|archive-date=2017-11-02|archive-url=https://web.archive.org/web/20171102020022/http://science.nationalgeographic.com/science/space/space-exploration/mars-exploration-article/|url-status=dead}}</ref>
{{toclimit|5}}

==Current status==
[[File:Schiaparelli 1889 versus Mars crop.jpg|thumb|upright=1.1|A 19th-century hand-drawn map by [[Giovanni Schiaparelli]], and a more modern photographic image, with a blended one in the middle]]
There are two functional rovers on the surface of Mars, the [[Curiosity (rover)|''Curiosity'']] and [[Perseverance (rover)|''Perseverance'']] rovers, both operated by the American space agency [[NASA]]. ''Perseverance'' was accompanied by the ''[[Ingenuity (helicopter)|Ingenuity]]'' helicopter, which scouted sites for ''Perseverance'' to study before its mission ended in 2024.<ref>{{Cite web|last=Loeffler|first=John|date=2021-08-17|title=NASA's Mars helicopter is now scouting new sites for Perseverance rover to study|url=https://www.techradar.com/news/nasas-mars-helicopter-is-now-scouting-new-sites-for-perseverance-rover-to-study|access-date=2021-10-01|website=TechRadar|language=en|archive-date=2021-10-01|archive-url=https://web.archive.org/web/20211001181419/https://www.techradar.com/news/nasas-mars-helicopter-is-now-scouting-new-sites-for-perseverance-rover-to-study|url-status=live}}</ref> The [[Zhurong (rover)|''Zhurong'' rover]], part of the ''[[Tianwen-1]]'' mission by the [[China National Space Administration]] (CNSA)<ref>{{Cite web |last=Stein |first=Vicky |date=8 February 2021 |title=Tianwen-1: China's first Mars mission |url=https://www.space.com/tianwen-1.html |url-status=live |archive-url=https://web.archive.org/web/20210225191937/https://www.space.com/tianwen-1.html |archive-date=2021-02-25 |access-date=2021-02-24 |website=Space.com |language=en}}</ref><ref name="bbc-tianwen1">{{Cite news|date=2021-05-14|title=China lands its Zhurong rover on Mars|work=[[BBC]]|url=https://www.bbc.com/news/science-environment-57122914|access-date=2021-05-14|archive-date=2021-05-15|archive-url=https://web.archive.org/web/20210515015422/https://www.bbc.com/news/science-environment-57122914|url-status=live}}</ref> was active until 20 May 2022 when it went into hibernation due to approaching sandstorms and Martian winter; the rover was expected to awaken from hibernation in December 2022, but as of April 2023 it has not moved and is presumed to be permanently inactive.<ref>{{cite web |author1=Pappas |first=Stephanie |date=27 April 2023 |title=China finally admits its hibernating Mars rover may never wake up |url=https://www.livescience.com/space/space-exploration/china-finally-admits-its-hibernating-mars-rover-may-never-wake-up |access-date=2023-08-29 |website=livescience.com}}</ref>  

There are seven orbiters surveying the planet: ''[[2001 Mars Odyssey|Mars Odyssey]]'', ''[[Mars Express]]'', ''[[Mars Reconnaissance Orbiter]]'', [[MAVEN]], the [[Trace Gas Orbiter]], the [[Emirates Mars Mission|Hope Mars Mission]], and the ''[[Tianwen-1]]'' orbiter, which have contributed massive amounts of information about Mars. Thus there are nine total vehicles currently exploring Mars: 2 rovers and 7 orbiters.

Various [[Mars sample return mission]]s are being planned like [[NASA-ESA Mars Sample Return]] that will pick up the samples currently being collected by the ''Perseverance'' rover.<ref name=":0">{{Cite web|url=http://www.space.com/13558-historic-mars-missions.html|title=A Brief History of Mars Missions {{!}} Mars Exploration|website=Space.com|access-date=2016-03-04|archive-date=2019-04-11|archive-url=https://web.archive.org/web/20190411014840/https://www.space.com/13558-historic-mars-missions.html|url-status=live}}</ref>

In April 2024, NASA selected several companies to begin studies on providing commercial services to further enable robotic science on Mars.<ref>{{Cite web |last= |title=NASA Selects Commercial Service Studies to Enable Mars Robotic Science |url=https://www.jpl.nasa.gov/news/nasa-selects-commercial-service-studies-to-enable-mars-robotic-science |access-date=2024-05-01 |website=NASA Jet Propulsion Laboratory (JPL) |language=en-US}}</ref>

==Martian system==
{{Main|Mars|Martian surface|Atmosphere of Mars|Moons of Mars}}
Mars has long been the subject of human interest. Early telescopic observations revealed color changes on the surface that were attributed to seasonal vegetation and apparent [[Martian canals|linear features]] were ascribed to intelligent design. Further telescopic observations found two moons, [[Phobos (moon)|Phobos]] and [[Deimos (moon)|Deimos]], polar ice caps and the feature now known as [[Olympus Mons]], the [[Solar System]]'s tallest mountain. The discoveries piqued further interest in the study and exploration of the red planet. Mars is a rocky planet, like [[Earth]], that formed around the same time, yet with only half the diameter of Earth, and a thin [[Atmosphere of Mars|atmosphere]]; it has a cold and desert-like surface.<ref>{{cite web | last=Sheehan | first=William | url=http://www.uapress.arizona.edu/onlinebks/mars/contents.htm | title=The Planet Mars: A History of Observation and Discovery | publisher=The University of Arizona Press, Tucson | year=1996 | access-date=2009-02-15 | archive-date=2017-09-11 | archive-url=https://web.archive.org/web/20170911172513/http://www.uapress.arizona.edu/onlinebks/MARS/CONTENTS.HTM | url-status=live }}</ref>

One way the surface of Mars has been categorized, is by thirty "[[Quadrangle (geography)|quadrangles]]", with each quadrangle named for a prominent physiographic feature within that quadrangle.<ref name="mapping mars" /><ref>{{cite web |url=http://ralphaeschliman.com/id30.htm |title=Online Atlas of Mars |work=Ralphaeschliman.com |access-date=December 16, 2012 |archive-date=May 5, 2013 |archive-url=https://web.archive.org/web/20130505042300/http://ralphaeschliman.com/id30.htm |url-status=live }}</ref>
{{clear}}
{{Mars Quads - By Name}}
{{clear}}

==Launch windows==
[[File:Mars distance from Earth.svg|thumb|upright=1.3|Spacecraft launches and Mars distance from Earth in millions of kilometers]]
The minimum-energy [[launch window]]s for a Martian expedition occur at intervals of approximately two years and two months (specifically 780 days, the planet's [[synodic period]] with respect to Earth).<ref name="portree2001">
{{Cite book | last1 = Porter | first1 = David S. F.  | title = Humans to Mars: Fifty Years of Mission Planning, 1950–2000 | publisher = NASA History Division | location = Washington D.C. | series =  NASA Monographs in Aerospace History Series, No. 21 — NASA SP-2001-4521 | date =  February 2001 | pages = 3,4| url = https://history.nasa.gov/monograph21/humans_to_Mars.htm  | access-date = 30 October 2024 | archive-url = https://web.archive.org/web/20190714112149/https://history.nasa.gov/monograph21/humans_to_Mars.htm | archive-date = 14 July 2019 | url-status = live}}</ref> In addition, the lowest available transfer energy varies on a roughly 16-year cycle.<ref name="portree2001"/> For example, a minimum occurred in the 1969 and 1971 launch windows, rising to a peak in the late 1970s, and hitting another low in 1986 and 1988.<ref name="portree2001"/>

{| class="wikitable"
|+ Launch opportunities<ref>{{cite web |last=McCleese |first=D. |display-authors=et al. |title=Robotic Mars Exploration Strategy |url=http://mepag.jpl.nasa.gov/reports/3715_Mars_Expl_Strat_GPO.pdf |url-status=live |archive-url=https://web.archive.org/web/20170123200835/http://mepag.jpl.nasa.gov/reports/3715_Mars_Expl_Strat_GPO.pdf |archive-date=23 January 2017 |access-date=9 February 2017 |website=nasa.gov}}</ref><ref>{{Cite web |url=https://www.researchgate.net/figure/Launch-windows-to-Mars-between-2015-and-2025-The-blue-line-shows-the-sum-of-hyperbolic_fig1_308274666 |title=Launch windows to Mars between 2015 and 2025. The blue line shows the... {{!}} Download Scientific Diagram<!-- Bot generated title --> |access-date=2021-10-26 |archive-date=2021-10-26 |archive-url=https://web.archive.org/web/20211026082900/https://www.researchgate.net/figure/Launch-windows-to-Mars-between-2015-and-2025-The-blue-line-shows-the-sum-of-hyperbolic_fig1_308274666 |url-status=live }}</ref><ref>{{Cite web |last=a-alzayani |date=2019-11-08 |title=Mars Launch Windows (2020-2030) |url=http://www.reddit.com/r/SpaceXLounge/comments/dtm5bc/mars_launch_windows_20202030/ |access-date=2024-01-31 |website=r/SpaceXLounge}}</ref>
! Year
! Window 
! Spacecraft (launched or planned)
|-
| 2013 || Nov || [[MAVEN]], [[Mars Orbiter Mission]]
|-
| 2016 || Mar || [[ExoMars Trace Gas Orbiter|ExoMars TGO]]
|- 
| 2018 || May || ''[[InSight]]''
|-
| 2020 || Jul–Sep ||(1) [[Mars Hope]] orbiter<br/>(2) [[Tianwen-1]] orbiter, deployable and remote camera, lander and [[Zhurong (rover)|''Zhurong'' rover]]<br/>(3) [[Mars 2020]] [[Perseverance (rover)|''Perseverance'' rover]] and [[Ingenuity (helicopter)|''Ingenuity'' helicopter]]
|-
| 2022 || Aug–Nov || none
|-
| 2024 || Oct–Nov ||[[EscaPADE]]
|-
|2026
|Nov–Dec
|(1) [[Martian Moons eXploration]] (MMX)<ref>{{Cite web |last=Foust |first=Jeff |date=2024-01-11 |title=Japanese Mars mission launch delayed to 2026 |url=https://spacenews.com/japanese-mars-mission-launch-delayed-to-2026/ |access-date=2024-01-31 |website=SpaceNews |language=en-US}}</ref>
(2) Impulse/[[Relativity Space|Relativity]] Mars lander<ref>{{Cite web |last=Foust |first=Jeff |date=2023-05-24 |title=Impulse and Relativity target 2026 for launch of first Mars lander mission |url=https://spacenews.com/impulse-and-relativity-target-2026-for-launch-of-first-mars-lander-mission/ |access-date=2024-01-31 |website=SpaceNews |language=en-US}}</ref>
|-
|2028/
2029
|Dec–Jan
| (1) ''[[Rosalind Franklin (rover)|Rosalind Franklin]]''<br/>(2) [[Mars Orbiter Mission 2]]
|}
{{clear}}

== Past missions 1960–1988 ==
{{main|List of missions to Mars}}
{{Bar graph
| title = Launches to Mars
| float = right
| bar_width = 20
| width_units = em
| data_max = 13
| label_type = Decade
| data_type = #
| label1 = 1960s
| data1 = 13
| label2 = 1970s
| data2 = 11
| label3 = 1980s
| data3 = 2
| label4 = 1990s
| data4 = 8
| label5 = 2000s
| data5 = 8 
| label6 = 2010s
| data6 = 6
| label7 = 2020s
| data7 = 3 <!-- as of 2021 --><!-- this bar graph should probably be moved to the "Current status" section -->
}}
Starting in 1960, the [[Soviet space program]] launched a series of probes to Mars including the first intended flybys and hard ([[impact (mechanics)|impact]]) landing ([[Mars 1962B]]).<ref name=log/> The first successful flyby of Mars was on 14–15 July 1965, by NASA's [[Mariner 4]].<ref name="NSSDCm">{{cite web  | url = https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-077A  | title = Mariner 4  | website = NSSDC Master Catalog  | publisher = [[NASA]]  | access-date = 2009-02-11  | archive-date = 2018-09-04  | archive-url = https://web.archive.org/web/20180904174225/https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1964-077A  | url-status = live  }}</ref> On November 14, 1971, [[Mariner 9]] became the first space probe to orbit another planet when it entered into orbit around Mars.<ref name="nasa_mariner9">{{cite web |url=http://solarsystem.nasa.gov/missions/profile.cfm?MCode=Mariner_09 |title=Mariner 9: Overview |publisher=NASA |url-status=dead |archive-url=https://web.archive.org/web/20120731101459/http://solarsystem.nasa.gov/missions/profile.cfm?MCode=Mariner_09 |archive-date=2012-07-31 }}</ref> The amount of data returned by probes increased substantially as technology improved.<ref name=log>[http://mars.jpl.nasa.gov/programmissions/missions/ NASA PROGRAM & MISSIONS Historical Log] {{Webarchive|url=https://web.archive.org/web/20111120110449/http://mars.jpl.nasa.gov/programmissions/missions/ |date=2011-11-20 }}. Mars.jpl.nasa.gov. Retrieved on 2012-08-14.</ref>

The first to contact the surface were two Soviet probes: [[Mars 2]] [[Lander (spacecraft)|lander]] on November 27 and [[Mars 3]] lander on December 2, 1971{{mdash}}Mars 2 failed during descent and Mars 3 failed about twenty seconds after the first Martian [[soft landing (rocketry)|soft landing]].<ref name="mars2">[https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-045D Mars 2 Lander – NASA] {{Webarchive|url=https://web.archive.org/web/20200615142210/https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-045D |date=2020-06-15 }}. Nssdc.gsfc.nasa.gov. Retrieved on 2012-05-10.</ref> [[Mars 6]] failed during descent but did return some corrupted atmospheric data in 1974.<ref name="nasa2">[https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1973-052A Mars 6 – NASA] {{Webarchive|url=https://web.archive.org/web/20170227064416/http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1973-052A |date=2017-02-27 }}. Nssdc.gsfc.nasa.gov. Retrieved on 2012-05-10.</ref> The 1975 NASA launches of the [[Viking program]] consisted of two orbiters, each with a lander that successfully soft landed in 1976. ''[[Viking 1]]'' remained operational for six years, ''[[Viking 2]]'' for three years. The Viking landers relayed the first color panoramas of Mars.<ref name="other_missions">{{cite web|url=http://burro.astr.cwru.edu/stu/20th_far_mars.html|title=Other Mars Missions|website=Journey through the galaxy|access-date=2006-06-13|url-status=dead|archive-url=https://web.archive.org/web/20060920021900/http://burro.astr.cwru.edu/stu/20th_far_mars.html|archive-date=2006-09-20}}</ref>

The Soviet probes [[Phobos program|Phobos 1 and 2]] were sent to Mars in 1988 to study Mars and its two moons, with a focus on Phobos. Phobos 1 lost contact on the way to Mars. Phobos 2, while successfully photographing Mars and Phobos, failed before it was set to release two landers to the surface of Phobos.<ref name="nature341">{{cite journal|author1=Sagdeev, R. Z. |author2=Zakharov, A. V. |title=Brief history of the Phobos mission|journal=Nature|volume=341|issue=6243|pages=581–585|date=October 19, 1989|doi=10.1038/341581a0|bibcode = 1989Natur.341..581S |s2cid=41464654 }}</ref>

== Past missions since 1992 ==
Mars has a reputation as a difficult space exploration target; just 25 of 55 missions through 2019, or 45.5%, have been fully successful, with a further three partially successful and partially failures.{{citation needed|date=February 2021}} However, of the sixteen missions since 2001, twelve have been successful and eight of these remain operational.

Missions that ended prematurely after Phobos 1 and 2 (1988) include (see [[#Probe difficulties|Probe difficulties]] section for more details):
*''[[Mars Observer]]'' (launched in 1992)
*[[Mars 96]] (1996)
*''[[Mars Climate Orbiter]]'' (1999)
*[[Mars Polar Lander]] with [[Deep Space 2]] (1999)
*[[Nozomi (spacecraft)|''Nozomi'']] (2003)
*''[[Beagle 2]]'' (2003)
*[[Fobos-Grunt]] with [[Yinghuo-1]] (2011)
*[[Schiaparelli EDM|''Schiaparelli'' lander]] (2016)

Following the 1993 failure of the [[Mars Observer]] orbiter, the NASA [[Mars Global Surveyor]] achieved Mars orbit in 1997. This mission was a complete success, having finished its primary mapping mission in early 2001. Contact was lost with the probe in November 2006 during its third extended program, spending exactly 10 operational years in space. The NASA [[Mars Pathfinder]], carrying a robotic exploration vehicle ''[[Sojourner (rover)|Sojourner]]'', landed in the [[Ares Vallis]] on Mars in the summer of 1997, returning many images.<ref name="cnn_mgs">{{cite news |title=Mars Global Surveyor |url=http://www.cnn.com/TECH/9706/pathfinder/surveyor/ |url-status=dead |archive-url=https://web.archive.org/web/20060415081709/http://www.cnn.com/TECH/9706/pathfinder/surveyor/ |archive-date=2006-04-15 |access-date=2006-06-13 |work=CNN – Destination Mars}}</ref>

{{Clear}}{{Mars map indicating landers}}
[[File:PIA24320-MarsLandingSites-20201216.jpg|thumb|upright=2.2|<div align="center">Mars landing sites (16 December 2020)</div>]]
NASA's ''[[Mars Odyssey]]'' orbiter entered Mars orbit in 2001.<ref name="nasa081009">{{cite web|url=http://mars.jpl.nasa.gov/odyssey/newsroom/pressreleases/20081009a.html|title=NASA's Mars Odyssey Shifting Orbit for Extended Mission|publisher=NASA|date=October 9, 2008|access-date=2008-11-15|archive-date=2012-03-13|archive-url=https://web.archive.org/web/20120313183655/http://mars.jpl.nasa.gov/odyssey/newsroom/pressreleases/20081009a.html|url-status=live}}</ref> ''Odyssey''{{'s}} [[Gamma Ray Spectrometer (2001 Mars Odyssey)|Gamma Ray Spectrometer]] detected significant amounts of hydrogen in the upper metre or so of [[regolith]] on Mars. This hydrogen is thought to be contained in large deposits of [[Water on Mars|water]] ice.<ref name="odyssey030314">{{cite web|last=Britt|first=Robert|url=http://www.space.com/missionlaunches/odyssey_update_030314.html|archive-url=https://web.archive.org/web/20060315103112/http://www.space.com/missionlaunches/odyssey_update_030314.html|archive-date=2006-03-15|title=Odyssey Spacecraft Generates New Mars Mysteries|website=Space.com|date=March 14, 2003|access-date=2006-06-13}}</ref>

The ''[[Mars Express]]'' mission of the [[European Space Agency]] (ESA) reached Mars in 2003. It carried the ''[[Beagle 2]]'' lander, which was not heard from after being released and was declared lost in February 2004. ''Beagle 2'' was located in January 2015 by the HiRise camera on NASA's ''Mars Reconnaissance Orbiter'' (MRO) having landed safely but failed to fully deploy its solar panels and antenna.<ref name="spotted">{{cite news |last=Pearson |first=Michael |url=http://edition.cnn.com/2015/01/16/world/mars-beagle-lander-found/index.html |title=UK's Beagle 2 lander spotted on Mars |work=CNN |date=16 January 2015 |access-date=2015-01-17 |archive-date=2015-01-17 |archive-url=https://web.archive.org/web/20150117092313/http://edition.cnn.com/2015/01/16/world/mars-beagle-lander-found/index.html |url-status=live }}</ref><ref name="esa20040211">{{cite news | author=ESA Media Relations Division | title=UK and ESA announce Beagle 2 inquiry | work=ESA News | date=February 11, 2004 | url=http://www.esa.int/esaCP/SEMQ5C1PGQD_Expanding_0.html | access-date=2011-04-28 | archive-date=2012-01-30 | archive-url=https://web.archive.org/web/20120130051016/http://www.esa.int/esaCP/SEMQ5C1PGQD_Expanding_0.html | url-status=live }}</ref> In early 2004, the ''Mars Express'' [[Planetary Fourier Spectrometer]] team announced the orbiter had detected [[Methane on Mars|methane]] in the Martian atmosphere, a potential [[biosignature]]. ESA announced in June 2006 the discovery of [[aurora (astronomy)|aurorae]] on Mars by the ''Mars Express''.<ref name="aurora">{{cite journal|last=Bertaux|first=Jean-Loup|display-authors=etal|doi=10.1038/nature03603|title=Discovery of an aurora on Mars|pmid=15944698|journal=Nature|volume=435|issue=7043|pages=790–4|date=June 9, 2005|bibcode = 2005Natur.435..790B |s2cid=4430534}}</ref>

{{Multiple image
| direction = vertical
| align = right
| image1 = MarsSunset.jpg
| image2 = PhoenixSolarPanelandRoboticArm.png
| width = 200
| caption1 = Martian sunset, [[Spirit rover|''Spirit'' rover]], 2005
| caption2 = North polar view, [[Phoenix (spacecraft)|''Phoenix'' lander]], 2008
}}

In January 2004, the NASA twin [[Mars Exploration Rovers]] named ''[[Spirit rover|Spirit]]'' (MER-A) and ''[[Opportunity rover|Opportunity]]'' (MER-B) landed on the surface of Mars. Both have met and exceeded all their science objectives. Among the most significant scientific returns has been conclusive evidence that liquid water existed at some time in the past at both landing sites. [[Dust devils#Martian dust devils|Martian dust devils]] and windstorms have occasionally cleaned both rovers' solar panels, and thus increased their lifespan.<ref name="nasa_rovers">{{cite web|url=http://marsrovers.jpl.nasa.gov/science/|title=Mars Exploration Rovers- Science|website=MER website|publisher=NASA|access-date=2006-06-13|archive-date=2012-03-20|archive-url=https://web.archive.org/web/20120320081308/http://marsrovers.jpl.nasa.gov/science/|url-status=live}}</ref> ''Spirit'' rover (MER-A) was active until 2010, when it stopped sending data because it got stuck in a sand dune and was unable to reorient itself to recharge its batteries.<ref name=":0" />

''[[Rosetta (spacecraft)|Rosetta]]'' came within 250&nbsp;km of Mars during its 2007 flyby.<ref name="bbcfly">[http://news.bbc.co.uk/2/hi/6394141.stm Space probe performs Mars fly-by] {{Webarchive|url=https://web.archive.org/web/20131022152818/http://news.bbc.co.uk/2/hi/6394141.stm |date=2013-10-22 }}. BBC News (2007-02-25). Retrieved on 2012-08-14.</ref> ''[[Dawn Mission|Dawn]]'' flew by Mars in February 2009 for a gravity assist on its way to investigate [[4 Vesta|Vesta]] and [[Ceres (dwarf planet)|Ceres]].<ref name="agle090212">{{cite web|last=Agle|first=D. C.|date=February 12, 2009|title=NASA Spacecraft Falling For Mars|url=http://www.jpl.nasa.gov/news/features.cfm?feature=2031|access-date=2009-12-27|publisher=NASA/JPL|archive-date=2012-01-18|archive-url=https://web.archive.org/web/20120118134850/http://www.jpl.nasa.gov/news/features.cfm?feature=2031|url-status=live}}</ref>

''[[Phoenix (spacecraft)|Phoenix]]'' landed on the north polar region of Mars on May 25, 2008.<ref name="ua_phoenix">{{cite web|title=Mars Pulls Phoenix In|url=http://phoenix.lpl.arizona.edu/05_25_pr.php|url-status=dead|archive-url=https://web.archive.org/web/20080527230312/http://phoenix.lpl.arizona.edu/05_25_pr.php|archive-date=2008-05-27|access-date=2008-05-25|website=University of Arizona Phoenix mission Website}}</ref> Its robotic arm dug into the Martian soil and the presence of water ice was confirmed on June 20, 2008.<ref name="phoenix_water">{{cite web|title=Phoenix: The Search for Water|url=http://www.nasa.gov/missions/solarsystem/phoenix_water.html|access-date=2007-03-03|website=NASA website|archive-date=2012-01-11|archive-url=https://web.archive.org/web/20120111131124/http://www.nasa.gov/missions/solarsystem/phoenix_water.html|url-status=live}}</ref><ref name="uanews_frozen_water">{{cite web|title=Frozen Water Confirmed on Mars|date=20 June 2008|url=http://uanews.org/node/20276|access-date=2008-08-24|publisher=UANews.org|archive-date=2012-03-20|archive-url=https://web.archive.org/web/20120320142240/http://uanews.org/node/20276|url-status=usurped}}</ref> The mission concluded on November 10, 2008, after contact was lost.<ref name="BBC_NASA_Mission_Declared_Dead">{{cite news|last=Amos|first=Jonathan|date=November 10, 2008|title=NASA Mars Mission declared dead|publisher=BBC|url=http://news.bbc.co.uk/2/hi/science/nature/7721032.stm|access-date=2008-11-10|archive-date=2012-01-05|archive-url=https://web.archive.org/web/20120105200154/http://news.bbc.co.uk/2/hi/science/nature/7721032.stm|url-status=live}}</ref> In 2008, the price of transporting material from the surface of Earth to the surface of Mars was approximately [[US$]]309,000 per [[kilogram]].<ref name="universe307">{{cite episode|credits=Mitchell, Cary L.; Purdue University|series=The Universe|series-link=The Universe (TV series)|title=Living in Space|episode-link=The Universe (TV series)#Season 3 (2008–09)|season=2008–09|number=307}}</ref>

The [[Indian Space Research Organisation]] (ISRO) launched their ''[[Mars Orbiter Mission]]'' (MOM) on November 5, 2013, and it was inserted into Mars orbit on September 24, 2014. India's ISRO is the fourth space agency to reach Mars, after the Soviet space program, NASA and ESA.<ref name="fourth space agency">{{cite news | first = Sanjoy | last = Majumder | title = India launches spacecraft to Mars | date = 5 November 2013 | url = https://www.bbc.co.uk/news/science-environment-24729073 | work = BBC News | access-date = 2014-01-26 | quote = If the satellite orbits the Red Planet, India's space agency is the fourth in the world after those of the US, Russia and Europe to undertake a successful Mars mission | archive-date = 2014-02-07 | archive-url = https://web.archive.org/web/20140207074147/http://www.bbc.co.uk/news/science-environment-24729073 | url-status = live }}</ref> India successfully placed a spacecraft into Mars orbit, and became the first country to do so in its maiden attempt.<ref>{{cite news | url=http://timesofindia.indiatimes.com/india/Isros-Mars-mission-successful-India-makes-history/articleshow/43296484.cms | title=Isro's Mars mission successful, India makes history | website=[[The Times of India]] | date=24 September 2014 | access-date=13 December 2014 | archive-date=5 October 2014 | archive-url=https://web.archive.org/web/20141005012744/http://timesofindia.indiatimes.com/india/Isros-Mars-mission-successful-India-makes-history/articleshow/43296484.cms | url-status=live }}</ref>

===Overview of missions===
The following entails a brief overview of previous missions to Mars, oriented towards orbiters and flybys; see also [[Mars landing]] and [[Mars rover]].

====Early Soviet missions====
{{Main|Mars 1M|Mars 1|Mars program}}

=====1960s=====
[[File:Mars 1M.jpg|thumb|[[Mars 1M]] spacecraft]]

Between 1960 and 1969, the Soviet Union launched nine probes intended to reach Mars. They all failed: three at launch; three failed to reach near-Earth orbit; one during the burn to put the spacecraft into trans-Mars trajectory; and two during the interplanetary orbit.

The [[Mars 1M]] programs (sometimes dubbed Marsnik in Western media) was the first Soviet uncrewed spacecraft interplanetary exploration program, which consisted of two flyby probes launched towards Mars in October 1960, [[Mars 1960A]] and [[Mars 1960B]] (also known as ''Korabl 4'' and ''Korabl 5'' respectively). After launch, the third stage pumps on both launchers were unable to develop enough pressure to commence ignition, so Earth parking orbit was not achieved. The spacecraft reached an altitude of 120&nbsp;km before reentry.

[[Sputnik 22|Mars 1962A]] was a Mars flyby mission, launched on October 24, 1962, and [[Sputnik 24|Mars 1962B]] an intended first Mars lander mission, launched in late December of the same year (1962). Both failed from either breaking up as they were going into Earth orbit or having the upper stage explode in orbit during the burn to put the spacecraft into trans-Mars trajectory.<ref name=":0" />

======The first success======
<!--Not a success if the unnamed orbiter did not enter orbit:
NASA had launched an orbiter{{what}} on 28 November 1952, it flew by Mars on 14 July 1965, it got 21 photos before it broke down.<ref name=":0" /> -->
{| class=wikitable style="text-align:center; font-size:88%; float:right; margin-left:1em"
|+ Selected Soviet Mars probes
! Spacecraft !! Orbiter or flyby outcome !! Lander outcome 
|-
| [[Mars 1]] || {{Failure}} || {{Failure}}
|-
| [[Mars 2]]|| {{Success}} || {{Failure}}
|-
| [[Mars 3]] || {{Partial success}}<!-- inserted in a different orbit than planned --> || {{Partial success}}<!-- landed but returned only one unusable picture before failing -->
|-
| [[Mars 4]] || {{Failure}} || {{n/a}}
|-
| [[Mars 5]]|| {{Partial success}}<!-- mission duration limited by depressurization of the instrument compartment --> || {{n/a}}
|-
| [[Mars 6]] || {{Success}} || {{Failure}}
|-
| [[Mars 7]] || {{Success}} || {{Failure}}
|-
| [[Phobos 1]] || {{Failure}} || {{Failure|Not deployed}}
|-
| [[Phobos 2]] || {{Partial success}}<!-- orbiter failed shortly before the last phase of the mission --> || {{Failure|Not deployed}}
|-
|}
[[Mars 1]] (1962 Beta Nu 1), an automatic interplanetary spacecraft launched to Mars on November 1, 1962, was the first probe of the Soviet [[Mars probe program]] to achieve interplanetary orbit. Mars 1 was intended to fly by the planet at a distance of about 11,000&nbsp;km and take images of the surface as well as send back data on [[cosmic radiation]], [[micrometeoroid]] impacts and Mars' [[magnetic field]], radiation environment, atmospheric structure, and possible organic compounds.<ref name="Sputnik 23">{{cite web | url = http://jtgnew.sjrdesign.net/exploration_space_planetary_mars.html | title = "Journey Through the Galaxy" Mars Program: Mars ~ 1960–1974 | access-date = 2014-01-26 | last = Robbins | first = Stuart | year = 2008 | publisher = SJR Design | archive-date = 2014-02-04 | archive-url = https://web.archive.org/web/20140204004556/http://jtgnew.sjrdesign.net/exploration_space_planetary_mars.html | url-status = live }}</ref><ref name="Mihos 2006">{{cite web|url=http://burro.astr.cwru.edu/stu/advanced/20th_soviet_mars.html |title=Mars (1960–1974): Mars 1 |access-date=2014-01-26 |last=Mihos |first=Chris |date=11 January 2006 |website=Department of Astronomy, Case Western Reserve University. |url-status=dead |archive-url=https://web.archive.org/web/20131013211415/http://burro.astr.cwru.edu/stu/advanced/20th_soviet_mars.html |archive-date=2013-10-13 }}</ref> Sixty-one radio transmissions were held, initially at 2-day intervals and later at 5-day intervals, from which a large amount of interplanetary data was collected. On 21 March 1963, when the spacecraft was at a distance of 106,760,000&nbsp;km from Earth, on its way to Mars, communications ceased due to failure of its antenna orientation system.<ref name="Sputnik 23"/><ref name="Mihos 2006"/>

In 1964, both Soviet probe launches, of [[Zond 1964A]] on June 4, and [[Zond 2]] on November 30, (part of the [[Zond program]]), resulted in failures. Zond 1964A had a failure at launch, while communication was lost with Zond 2 en route to Mars after a mid-course maneuver, in early May 1965.<ref name=":0" />

In 1969, and as part of the [[Mars probe program]], the Soviet Union prepared two identical 5-ton orbiters called M-69, dubbed by NASA as [[Mars 1969A]] and [[Mars 1969B]]. Both probes were lost in launch-related complications with the newly developed Proton rocket.<ref>{{cite web | url= http://nssdc.gsfc.nasa.gov/planetary/chronology_mars.html | title= NASA A Chronology of Mars Exploration | access-date= 2007-03-28 | archive-date= 2000-10-17 | archive-url= https://web.archive.org/web/20001017100323/http://nssdc.gsfc.nasa.gov/planetary/chronology_mars.html | url-status= live }}</ref>

=====1970s=====
The USSR intended to have the first artificial satellite of Mars beating the planned American [[Mariner 8]] and [[Mariner 9]] Mars orbiters. In May 1971, one day after Mariner 8 malfunctioned at launch and failed to reach orbit, [[Kosmos 419|Cosmos 419 (Mars 1971C)]], a heavy probe of the Soviet Mars program M-71, also failed to launch. This spacecraft was designed as an orbiter only, while the next two probes of project M-71, [[Mars 2]] and [[Mars 3]], were multipurpose combinations of an orbiter and a lander with small skis-walking [[rover (space exploration)|rover]]s, [[PrOP-M]], that would be the first planet rovers outside the Moon. They were successfully launched in mid-May 1971 and reached Mars about seven months later. On November 27, 1971, the lander of Mars 2 [[Emergency landing|crash-landed]] due to an on-board computer malfunction and became the first man-made object to reach the surface of Mars. On 2 December 1971, the Mars 3 lander became the first spacecraft to achieve a [[Soft landing (rocketry)|soft landing]], but its transmission was interrupted after 14.5 seconds.<ref name="Perminov1">{{cite book |last=Perminov |first=V. G. |url=https://archive.org/details/difficultroadtom00perm/page/58 |title=The Difficult Road to Mars – A Brief History of Mars Exploration in the Soviet Union |date=July 1999 |publisher=NASA Headquarters History Division |isbn=978-0-16-058859-4 |page=[https://archive.org/details/difficultroadtom00perm/page/58 58]}}</ref>

The Mars 2 and 3 orbiters sent back a relatively large volume of data covering the period from December 1971 to March 1972, although transmissions continued through to August. By 22 August 1972, after sending back data and a total of 60 pictures, Mars 2 and 3 concluded their missions. The images and data enabled creation of surface relief maps, and gave information on the Martian [[gravity]] and [[magnetic fields]].<ref>{{cite web | url= https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-049A | title= NASA (NSSDC) Master Catalog Display Mars 3 | access-date= 2007-03-28 | archive-date= 2019-05-14 | archive-url= https://web.archive.org/web/20190514144519/https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-049A | url-status= live }}</ref>

In 1973, the Soviet Union sent four more probes to Mars: the [[Mars program#Mars 4|Mars 4]] and [[Mars program#Mars 5|Mars 5]] orbiters and the [[Mars program#Mars 6|Mars 6]] and [[Mars program#Mars 7|Mars 7]] flyby/lander combinations. All missions except Mars 7 sent back data, with Mars 5 being most successful. Mars 5 transmitted just 60 images before a loss of pressurization in the transmitter housing ended the mission. Mars 6 lander transmitted data during descent, but failed upon impact. Mars 4 flew by the planet at a range of 2200&nbsp;km returning one swath of pictures and radio [[occultation]] data, which constituted the first detection of the nightside [[ionosphere]] on Mars.<ref>{{cite web | url= https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1973-047A | title= NASA (NSSDC) Master Catalog Display Mars 4 | access-date= 2007-03-28 | archive-date= 2017-02-27 | archive-url= https://web.archive.org/web/20170227005406/http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1973-047A | url-status= live }}</ref> Mars 7 probe separated prematurely from the carrying vehicle due to a problem in the operation of one of the onboard systems ([[Spacecraft attitude control|attitude control]] or retro-rockets) and missed the planet by {{convert|1300|km|au}}.{{citation needed|date=December 2015}}

====Mariner program====
{{Main|Mariner program|Mariner 4|Mariner 6 and 7|Mariner 9}}
[[File:Mars (Mariner 4).jpg|thumb|upright|The first close-up images taken of Mars in 1965 from Mariner 4 show an area about 330 km across by 1200 km from limb to bottom of frame.]]

In 1964, [[NASA]]'s [[Jet Propulsion Laboratory]] made two attempts at reaching Mars. [[Mariner 3]] and [[Mariner 4]] were identical spacecraft designed to carry out the first flybys of Mars. Mariner 3 was launched on November 5, 1964, but the shroud encasing the spacecraft atop its rocket failed to open properly, dooming the mission. Three weeks later, on November 28, 1964, Mariner 4 was launched successfully on a 7{{frac|1|2}}-month voyage to Mars.{{citation needed|date=December 2015}}

Mariner 4 flew past Mars on July 14, 1965, providing the first close-up photographs of another planet. The pictures, gradually played back to Earth from a small tape recorder on the probe, showed impact craters. It provided radically more accurate data about the planet; a surface [[atmospheric pressure]] of about 1% of Earth's and daytime temperatures of −100&nbsp;°C (−148&nbsp;°F) were estimated. No [[magnetic field]]<ref name="O'Gallagher">{{Cite journal |last1=O'Gallagher |first1=J. J. |last2=Simpson |first2=J. A. |date=September 10, 1965 |title=Search for Trapped Electrons and a Magnetic Moment at Mars by Mariner IV |journal=Science |series=New Series |volume=149 |issue=3689 |pages=1233–1239 |bibcode=1965Sci...149.1233O |doi=10.1126/science.149.3689.1233 |pmid=17747452 |s2cid=21249845}}</ref><ref name="Smith">{{Cite journal|title=Magnetic Field Measurements Near Mars|last1=Smith|first1=Edward J.|last2=Davis|first2=L.|last3=Coleman|first3=Paul|last4=Jones|first4=Douglas|journal=Science |series=New Series|volume=149|issue=3689|date=September 10, 1965|pages=1241–1242|doi=10.1126/science.149.3689.1241|pmid=17747454|bibcode=1965Sci...149.1241S|s2cid=43466009}}</ref> or [[Van Allen radiation belt|Martian radiation belts]]<ref name="Van Allen">{{Cite journal |last1=Van Allen |first1=J. A. |last2=Frank |first2=L. A. |last3=Krimigis |first3=S. M. |last4=Hills |first4=H. K. |date=September 10, 1965 |title=Absence of Martian Radiation Belts and Implications Thereof |journal=Science |series=New Series |volume=149 |issue=3689 |pages=1228–1233 |bibcode=1965Sci...149.1228V |doi=10.1126/science.149.3689.1228 |pmid=17747451 |s2cid=29117648 |hdl-access=free |hdl=2060/19650024318}}</ref> were detected. The new data meant redesigns for then planned Martian landers, and showed life would have a more difficult time surviving there than previously anticipated.<ref name="Leighton">{{Cite journal|title=Mariner IV Photography of Mars: Initial Results|last=Leighton|first=Robert B.|author2=Murray, Bruce C. |author3=Sharp, Robert P. |author4=Allen, J. Denton |author5= Sloan, Richard K. |journal=Science |series=New Series|volume=149|issue=3684|date=August 6, 1965|pages=627–630|doi=10.1126/science.149.3684.627|pmid=17747569|bibcode=1965Sci...149..627L|s2cid=43407530}}</ref><ref name="Kliore">{{Cite journal|title=Occultation Experiment: Results of the First Direct Measurement of Mars's Atmosphere and Ionosphere|last=Kliore|first=Arvydas|author2=Cain, Dan L. |author3=Levy, Gerald S. |author4=Eshleman, Von R. |author5=Fjeldbo, Gunnar |author6= Drake, Frank D. |journal=Science |series=New Series|volume=149|issue=3689|date=September 10, 1965|pages=1243–1248|doi=10.1126/science.149.3689.1243|pmid=17747455|bibcode=1965Sci...149.1243K|s2cid=34369864}}</ref><ref name="Salisbury">{{Cite journal|title=Martian Biology|last=Salisbury|first=Frank B.|date=April 6, 1962|journal=Science |series=New Series|volume=136|issue=3510|pages=17–26|doi=10.1126/science.136.3510.17|pmid=17779780|bibcode=1962Sci...136...17S|s2cid=39512870}}</ref><ref name="Kilston">{{Cite journal|title=A Search for Life on Earth at Kilometer Resolution|last=Kilston|first=Steven D.|author2=Drummond, Robert R. |author3=Sagan, Carl |year=1966|journal=Icarus|volume=5|issue=1–6|pages=79–98|doi=10.1016/0019-1035(66)90010-8|bibcode=1966Icar....5...79K}}</ref>

[[File:Mars m04 11e.jpg|thumb|upright|[[Mariner (crater)|Mariner Crater]], as seen by Mariner 4. The location is [[Phaethontis quadrangle]].]]
NASA continued the Mariner program with another pair of Mars flyby probes, [[Mariner 6 and 7]]. They were sent at the next launch window, and reached the planet in 1969. During the following launch window the Mariner program again suffered the loss of one of a pair of probes. [[Mariner 9]] successfully entered orbit about Mars, the first spacecraft ever to do so, after the launch time failure of its sister ship, [[Mariner 8]]. When Mariner 9 reached Mars in 1971, it and two Soviet orbiters (Mars 2 and Mars 3) found that a planet-wide dust storm was in progress. The mission controllers used the time spent waiting for the storm to clear to have the probe rendezvous with, and photograph, [[Phobos (moon)|Phobos]]. When the storm cleared sufficiently for Mars' surface to be photographed by Mariner 9, the pictures returned represented a substantial advance over previous missions. These pictures were the first to offer more detailed evidence that liquid water might at one time have flowed on the planetary surface. They also finally discerned the true nature of many Martian albedo features. For example, Nix Olympica was one of only a few features that could be seen during the planetary duststorm, revealing it to be the [[List of tallest mountains in the Solar System|highest mountain]] ([[volcano]], to be exact) on any planet in the entire [[Solar System]], and leading to its reclassification as [[Olympus Mons]].{{citation needed|date=December 2015}}

====Viking program====
{{main|Viking program|Viking 1|Viking 2|Viking spacecraft biological experiments}}
The Viking program launched ''Viking 1'' and ''Viking 2'' spacecraft to Mars in 1975; The program consisted of two orbiters and two landers – these were the second and third spacecraft to successfully land on Mars.
{|
|-
| <!-- For over 2 decades, until Pathfinder, Viking 1/2 images were our only images taken on the surface of Mars -->
 {{multiple image
| align             = left
 <!-- Set so all images have a height of 100 pixel. -->| width1            = 150
| width2            = 160
| width3            = 180
| width4            = 180
| width5            = 146
| width6            = 288
| image2            = PIA00563-Viking1-FirstColorImage-19760721.jpg
| caption2          = ''Viking&nbsp;1'' lander site (1st color, July 21, 1976)
| image3            = First Color Image of the Viking Lander 2 Site.jpg
| caption3          = ''Viking&nbsp;2'' lander site (1st color, September 5, 1976)
| image4            = Vl2 22g144-MarsViking2-19770925.gif
| caption4          = ''Viking&nbsp;2'' lander site (September 25, 1977)
| image5            = Mars Viking 21i093.png
| caption5          = (False color image) Frost at ''Viking&nbsp;2'' site (May 18, 1979)
| image6            = Mars Viking 12a240.png
| caption6          = Martian sunset over [[Chryse Planitia]] at ''Viking&nbsp;1'' site (August 20, 1976)
| image1            = 
}}

|}

The primary scientific objectives of the lander mission were to search for [[biosignature]]s and observe [[meteorology|meteorologic]], [[seismology|seismic]] and [[magnetism|magnetic]] properties of Mars. The results of the [[Viking biological experiments|biological experiments on board the Viking landers]] remain inconclusive, with a reanalysis of the Viking data published in 2012 suggesting signs of [[Microbe|microbial]] life on Mars.<ref name="Bianciardi-2012">{{cite journal |last1=Bianciardi |first1=Giorgio |last2=Miller |first2=Joseph D. |last3=Straat |first3=Patricia Ann |last4=Levin |first4=Gilbert V. |title=Complexity Analysis of the Viking Labeled Release Experiments |journal=IJASS |date=March 2012 |volume=13 |issue=1 |pages=14–26 |doi=10.5139/IJASS.2012.13.1.14 |bibcode=2012IJASS..13...14B |doi-access=free }}</ref><ref name="Discovery-20120412">{{cite web |last=Klotz |first=Irene |title=Mars Viking Robots 'Found Life' |url=http://news.discovery.com/space/mars-life-viking-landers-discovery-120412.html |date=12 April 2012 |publisher=[[Discovery Channel|DiscoveryNews]] |access-date=2012-04-16 |archive-date=2012-04-14 |archive-url=https://web.archive.org/web/20120414195922/http://news.discovery.com/space/mars-life-viking-landers-discovery-120412.html |url-status=live }}</ref>

{|
|-
|<!-- Images important for the history of the exploration of Mars -->
 {{multiple image
| align             = left
 <!-- Set so all images have a height of 100 pixel. -->| width1            = 200
| width2            = 275
| width3            = 230
| width4            = 250
| image1            = Detail_of_Maja_Valles_Flow.jpg
| caption1          = Flood erosion at [[Dromore (crater)|Dromore]] crater
| image2            = Viking Teardrop Islands.jpg
| caption2          = Tear-drop shaped islands at [[Oxia Palus quadrangle|Oxia Palus]]
| image3            = Streamlined Islands in Maja Valles.jpg
| caption3          = Streamlined islands in [[Lunae Palus quadrangle|Lunae Palus]]
| image4            = Chryse Planitia Scour Patterns.jpg
| caption4          = Scour patterns located in Lunae Palus
}}

|}
The Viking orbiters revealed that large floods of water carved deep valleys, eroded grooves into bedrock, and traveled thousands of kilometers. Areas of branched streams, in the southern hemisphere, suggest that rain once fell.<ref>{{cite book|author=Matthews, Mildred S.|title=Mars|url=https://books.google.com/books?id=ze27j5sSJVEC|access-date=14 August 2012|date=1 October 1992|publisher=University of Arizona Press|isbn=978-0-8165-1257-7|archive-date=11 January 2014|archive-url=https://web.archive.org/web/20140111161629/http://books.google.com/books?id=ze27j5sSJVEC|url-status=live}}</ref><ref>Raeburn, P. (1998) "Uncovering the Secrets of the Red Planet Mars". National Geographic Society. Washington D.C. {{ISBN|0792273737}}.</ref><ref>{{cite book|author1=Moore, Patrick|author2=Hunt, Garry|title=The Atlas of the Solar System|url=https://books.google.com/books?id=jb87PgAACAAJ|access-date=2012-08-14|date=1 January 1997|publisher=Chancellor Press|isbn=978-0-7537-0014-3|archive-date=2014-01-03|archive-url=https://web.archive.org/web/20140103070140/http://books.google.com/books?id=jb87PgAACAAJ|url-status=live}}</ref>

====''Mars Pathfinder'', ''Sojourner'' rover====
[[File:Pathfinder01.jpg|thumb|upright=1.4|''[[Sojourner (rover)|Sojourner]]'' takes Alpha Proton X-ray Spectrometer measurements of the [[Yogi Rock]].]]
{{main|Mars Pathfinder|Sojourner (rover)|Mars landing}}
''Mars Pathfinder'' was a U.S. spacecraft that landed a base station with a [[rover (space exploration)|roving probe]] on Mars on July 4, 1997. It consisted of a lander and a small {{convert|10.6|kg|lb|adj=on}} wheeled robotic rover named ''Sojourner'', which was the first rover to operate on the surface of Mars.<ref name=Rover>{{cite web | url = http://www.planetary.org/programs/projects/space_information/tpr_1990_4_anderson.html | archive-url = https://web.archive.org/web/20110605111822/http://www.planetary.org/programs/projects/space_information/tpr_1990_4_anderson.html | archive-date = 2011-06-05 | title = The First Rover on Mars – The Soviets Did It in 1971 | access-date = 2012-04-05 | first = Charlene | last = Anderson | date = August 1990 | publisher = The Planetary Report}}</ref><ref>[http://todayinspacehistory.wordpress.com/2007/12/04/december-4-1996-first-successful-mars-rover-sojourner-was-launched-toward-mars/ December 4, 1996 – First successful Mars Rover – ''Sojourner'' – was launched] {{Webarchive|url=https://web.archive.org/web/20131224120045/http://todayinspacehistory.wordpress.com/2007/12/04/december-4-1996-first-successful-mars-rover-sojourner-was-launched-toward-mars/ |date=December 24, 2013 }}. Todayinspacehistory.wordpress.com (2007-12-04). Retrieved on 2012-08-14.</ref> In addition to scientific objectives, the Mars Pathfinder mission was also a "proof-of-concept" for various technologies, such as an [[Airbag#Aircraft airbag landing systems|airbag landing system]] and automated obstacle avoidance, both later exploited by the [[Mars Exploration Rovers]].<ref name=Rover/>

====''Mars Global Surveyor''====
{{Main|Mars Global Surveyor}}
[[File:Mars gullies.800px.jpg|thumb|left|alt=This image from ''Mars Global Surveyor'' spans a region about 1500 meters across. Gullies, similar to those formed on Earth, are visible from Newton Basin in Sirenum Terra.|Gullies, similar to those formed on Earth, are visible on this image from ''Mars Global Surveyor''.]]
After the 1992 failure of NASA's ''[[Mars Observer]]'' orbiter, NASA retooled and launched ''[[Mars Global Surveyor]]'' (MGS). ''Mars Global Surveyor'' launched on November 7, 1996, and entered orbit on September 12, 1997. After a year and a half trimming its orbit from a looping ellipse to a circular track around the planet, the spacecraft began its primary mapping mission in March 1999. It observed the planet from a low-altitude, nearly [[polar orbit]] over the course of one complete Martian year, the equivalent of nearly two Earth years. ''Mars Global Surveyor'' completed its primary mission on January 31, 2001, and completed several extended mission phases until communication was lost in 2007.<ref name="objectives">{{cite web |title=Mar Global Surveyor – Science Summary |url=http://mars.jpl.nasa.gov/mgs/science/ |access-date=6 October 2013 |work=NASA |publisher=Jet Propulsion Laboratory}}</ref>

The mission studied the entire Martian surface, atmosphere, and interior, and returned more data about the red planet than all previous Mars missions combined. The data has been archived and remains available publicly.<ref>{{cite web | url=http://pds-geosciences.wustl.edu/missions/mgs/ | title=PDS Geosciences Node Data and Services: MGS | access-date=2006-08-27 | archive-date=2006-09-11 | archive-url=https://web.archive.org/web/20060911005935/http://pds-geosciences.wustl.edu/missions/mgs/ | url-status=live }}</ref>

[[File:Kasei Valles topolabled.JPG|thumb|upright=1.6|alt=This color-coded elevation map was produced from data collected by ''Mars Global Surveyor''. It shows an area around Northern Kasei Valles, showing relationships among [[Kasei Valles]], [[Bahram Vallis]], [[Vedra Vallis]], [[Maumee Vallis]], and [[Maja Valles]]. Map location is in [[Lunae Palus quadrangle]] and includes parts of Lunae Planum and [[Chryse Planitia]].|A color-coded elevation map produced from data collected by ''Mars Global Surveyor'' indicating the result of floods on Mars]]

Among key scientific findings, ''Global Surveyor'' took pictures of gullies and debris flow features that suggest there may be current sources of liquid water, similar to an [[aquifer]], at or near the surface of the planet. Similar channels on Earth are formed by flowing water, but on Mars the temperature is normally too cold and the atmosphere too thin to sustain liquid water. Nevertheless, many scientists hypothesize that liquid groundwater can sometimes surface on Mars, erode gullies and channels, and pool at the bottom before freezing and evaporating.<ref>{{cite news|url=https://science.nasa.gov/science-news/science-at-nasa/2001/ast05jan_1|title=The Case of the Missing Mars Water|publisher=NASA|date=4 January 2001|accessdate=15 April 2022|archive-date=29 September 2012|archive-url=https://web.archive.org/web/20120929154034/http://science.nasa.gov/science-news/science-at-nasa/2001/ast05jan_1/|url-status=dead}}</ref>

[[Magnetometer]] readings showed that the planet's [[magnetic field]] is not globally generated in the planet's core, but is localized in particular areas of the crust. New temperature data and closeup images of the Martian moon Phobos showed that its surface is composed of powdery material at least 1 metre (3&nbsp;feet) thick, caused by millions of years of meteoroid impacts. Data from the spacecraft's [[laser]] [[altimeter]] gave scientists their first 3-D views of Mars' north polar ice cap in January 1999.<ref>{{cite news|url=https://www.jpl.nasa.gov/images/pia01337-laser-provides-first-3-d-view-of-mars-north-pole|title=Laser Provides First 3-D View of Mars' North Pole|author=Jet Propulsion Laboratory|publisher=NASA|date=1999-01-07}}</ref>

Faulty software uploaded to the vehicle in June 2006 caused the spacecraft to orient its solar panels incorrectly several months later, resulting in battery overheating and subsequent failure.<ref>{{cite web| url=https://www.scientificamerican.com/article/human-error-caused-mars-g/| title=Human Error Caused Mars Global Surveyor Failure| author=Minkel, JR| website=[[Scientific American]]| access-date=2018-11-27| archive-date=2018-11-29| archive-url=https://web.archive.org/web/20181129100053/https://www.scientificamerican.com/article/human-error-caused-mars-g/| url-status=live}}</ref> On November 5, 2006, MGS lost contact with Earth.<ref>{{cite web|url=http://www.space.com/missionlaunches/061121_mgs_update.html|title=Mars Global Surveyor Remains Silent, Feared Lost|author=David, Leonard|website=[[Space.com]]|date=21 November 2006|access-date=2007-04-01|archive-date=2006-11-24|archive-url=https://web.archive.org/web/20061124232646/http://www.space.com/missionlaunches/061121_mgs_update.html|url-status=live}}</ref> NASA ended efforts to restore communication on January 28, 2007.<ref>{{cite web|url=http://mars.jpl.nasa.gov/mgs/mission/mgs_white_paper_20070413.pdf|title=Mars Global Surveyor (MGS) Spacecraft Loss of Contact|author=Mars Global Surveyor Operations Review Board|access-date=2012-02-15|archive-date=2011-10-26|archive-url=https://web.archive.org/web/20111026083725/http://mars.jpl.nasa.gov/mgs/mission/mgs_white_paper_20070413.pdf|url-status=live}}</ref>

====''Mars Odyssey'' and ''Mars Express''====
{{Main|2001 Mars Odyssey|Mars Express}}
[[File:Animation of 2001 Mars Odyssey trajectory around Mars.gif |thumb |right |Animation of ''[[2001 Mars Odyssey]]''{{'s}} trajectory around [[Mars]] from 24 October 2001 to 24 October 2002<br />{{legend2|magenta| ''[[2001 Mars Odyssey]]''}}{{·}}{{legend2| Lime|[[Mars]]}}]]
[[File:Animation of Mars Express trajectory around Mars.gif |thumb |right |Animation of ''[[Mars Express]]''{{'s}} trajectory around [[Mars]] from 25 December 2003 to 1 January 2010<br />{{legend2|magenta| ''[[Mars Express]]''}}{{·}}{{legend2| Lime|[[Mars]]}}]]
In 2001, NASA's ''[[Mars Odyssey]]'' orbiter arrived at Mars. Its mission is to use [[spectrometer]]s and imagers to hunt for evidence of past or present [[water]] and volcanic activity on Mars. In 2002, it was announced that the probe's [[gamma-ray spectrometer]] and [[neutron]] spectrometer had detected large amounts of [[hydrogen]], indicating that there are vast deposits of water ice in the upper three meters of Mars' soil within 60° latitude of the south pole.{{Citation needed|date=August 2012}}

On June 2, 2003, the [[European Space Agency]]'s ''[[Mars Express]]'' set off from [[Baikonur Cosmodrome]] to Mars. The Mars Express craft consists of the [[Mars Express Orbiter]] and the stationary lander [[Beagle 2]]. The lander carried a digging device and the smallest mass [[spectrometer]] created to date, as well as a range of other devices, on a robotic arm in order to accurately analyze soil beneath the dusty surface to look for [[biosignature]]s and [[biomolecule]]s.{{citation needed|date=December 2015}}

The orbiter entered Mars orbit on December 25, 2003, and Beagle 2 entered Mars' atmosphere the same day. However, attempts to contact the lander failed. Communications attempts continued throughout January, but Beagle 2 was declared lost in mid-February, and a joint inquiry was launched by the UK and ESA. The Mars Express Orbiter confirmed the presence of water ice and carbon dioxide ice at the planet's south pole, while NASA had previously confirmed their presence at the north pole of Mars.{{citation needed|date=December 2015}}

The lander's fate remained a mystery until it was located intact on the surface of Mars in a series of images from the ''[[Mars Reconnaissance Orbiter]]''.<ref name="NASA-20150116">{{cite web |last=Webster |first=Guy |title='Lost' 2003 Mars Lander Found by Mars Reconnaissance Orbiter |url=http://www.nasa.gov/jpl/lost-2003-mars-lander-found-by-mars-reconnaissance-orbiter/ |date=16 January 2015 |website=[[NASA]] |access-date=16 January 2015 |archive-date=24 February 2017 |archive-url=https://web.archive.org/web/20170224145904/https://www.nasa.gov/jpl/lost-2003-mars-lander-found-by-mars-reconnaissance-orbiter/ |url-status=live }}</ref><ref name="NYT-20150116">{{cite news |agency=[[Associated Press]] |title=Mars Orbiter Spots Beagle 2, European Lander Missing Since 2003 |url=https://www.nytimes.com/2015/01/17/science/space/missing-lander-beagle-2-finally-located-on-mars.html |date=16 January 2015 |work=[[The New York Times]] |access-date=2015-01-17 |archive-date=2018-10-24 |archive-url=https://web.archive.org/web/20181024142634/https://www.nytimes.com/2015/01/17/science/space/missing-lander-beagle-2-finally-located-on-mars.html |url-status=live }}</ref> The images suggest that two of the spacecraft's four [[solar panel]]s failed to deploy, blocking the spacecraft's communications antenna. ''Beagle 2'' is the first British and first European probe to achieve a soft landing on Mars.{{citation needed|date=December 2015}}

====MER, ''Opportunity'' rover, ''Spirit'' rover, ''Phoenix'' lander====
{{Main|Mars Exploration Rover|Opportunity rover|Spirit rover|Phoenix lander}}
{{See also|Mars landing}}
[[File:Mars from Phoenix.jpg|thumb|Polar surface as seen by the ''Phoenix'' lander]]
NASA's Mars Exploration Rover Mission (MER), started in 2003, was a robotic space mission involving two rovers, ''Spirit'' (MER-A) and ''Opportunity'', (MER-B) that explored the Martian surface geology. The mission's scientific objective was to search for and characterize a wide range of rocks and soils that hold clues to past water activity on Mars. The mission was part of NASA's Mars Exploration Program, which includes three previous successful landers: the two Viking program landers in 1976; and Mars Pathfinder probe in 1997.{{citation needed|date=December 2015}}

====''Rosetta'' and ''Dawn'' swingbys====
{{Main|Rosetta (spacecraft)|Dawn Mission}}
The [[ESA]] [[Rosetta (spacecraft)|''Rosetta'']] space probe mission to the comet [[67P/Churyumov-Gerasimenko]] flew within 250&nbsp;km of Mars on February 25, 2007, in a [[gravitational slingshot]] designed to slow and redirect the spacecraft.<ref>
{{cite web | url = http://www.physorg.com/news91439922.html| archive-url = https://web.archive.org/web/20070225091756/http://www.physorg.com/news91439922.html| archive-date = 2007-02-25|date=2007-02-23 | title = Europe set for billion-euro gamble with comet-chasing probe | publisher = PhysOrg.com}}</ref>

The NASA [[Dawn Mission|''Dawn'']] spacecraft used the gravity of Mars in 2009 to change direction and velocity on its way to [[4 Vesta|Vesta]], and tested out ''Dawn''{{'s}} cameras and other instruments on Mars.<ref>{{cite web |url=http://www.space.com/missionlaunches/090218-dawn-asteroid-mars.html |title=Asteroid-Bound Probe Zooms Past Mars |publisher=Space.com |first=Tariq |last=Malik |date=February 18, 2009 |access-date=2015-08-20 |archive-date=2010-03-27 |archive-url=https://web.archive.org/web/20100327123433/http://www.space.com/missionlaunches/090218-dawn-asteroid-mars.html |url-status=live }}</ref>

==== Fobos-Grunt ====
{{main|Fobos-Grunt}}

On November 8, 2011, Russia's [[Roscosmos]] launched an ambitious mission called [[Fobos-Grunt]]. It consisted of a lander aimed to [[sample return|retrieve a sample]] back to Earth from Mars' moon [[Phobos (moon)|Phobos]], and place the Chinese [[Yinghuo-1]] probe in Mars' orbit. The Fobos-Grunt mission suffered a complete control and communications failure shortly after launch and was left stranded in [[low Earth orbit]], later falling back to Earth.<ref>[https://www.bbc.co.uk/news/science-environment-16491457 "Russia's failed Phobos-Grunt space probe heads to Earth"] {{Webarchive|url=https://web.archive.org/web/20180517231321/http://www.bbc.co.uk/news/science-environment-16491457 |date=2018-05-17 }}, BBC News (2012-01-14).</ref> The Yinghuo-1 satellite and Fobos-Grunt underwent destructive re-entry on January 15, 2012, finally disintegrating over the Pacific Ocean.<ref name=ABCFinished>[https://abcnews.go.com/Technology/phobos-grunt-failed-russian-mars-probe-falls-earth/story?id=15366151 "Phobos-Grunt: Failed Russian Mars Probe Falls to Earth"] {{Webarchive|url=https://web.archive.org/web/20200701185022/https://abcnews.go.com/Technology/phobos-grunt-failed-russian-mars-probe-falls-earth/story?id=15366151 |date=2020-07-01 }}. ABC News, January 15, 2012.</ref><ref name=BBCJan15>[https://www.bbc.co.uk/news/science-environment-16491457 "Phobos-Grunt: Failed probe likely to return late Sunday"] {{Webarchive|url=https://web.archive.org/web/20180517231321/http://www.bbc.co.uk/news/science-environment-16491457 |date=2018-05-17 }}. [[BBC News]] (2012-01-15).</ref><ref name="DeclaredLost">Morris Jones (2011-11-17). [http://www.spacedaily.com/reports/Yinghuo_Was_Worth_It_999.html "Yinghuo Was Worth It"], {{Webarchive|url=https://web.archive.org/web/20131126140654/http://www.spacedaily.com/reports/Yinghuo_Was_Worth_It_999.html|date=2013-11-26}}. Space Daily. Retrieved 19 November 2011.</ref>

====Mars Orbiter Mission====
The [[Mars Orbiter Mission]], also called ''Mangalyaan'', was launched on 5 November 2013 by the [[Indian Space Research Organisation]] (ISRO).<ref name=mav>{{cite web|url=http://www.nasa.gov/mission_pages/maven/main/index.html|title=Mars Atmosphere and Volatile Evolution mission – MAVEN|website=NASA|access-date=12 June 2015|date=2015-02-24|archive-date=2019-02-26|archive-url=https://web.archive.org/web/20190226073617/http://www.nasa.gov/mission_pages/maven/main/index.html|url-status=live}}</ref> It was successfully inserted into Martian orbit on 24 September 2014. The mission is a technology demonstrator, and as secondary objective, it will also study the Martian atmosphere. This is India's first mission to Mars, and with it, ISRO became the fourth space agency to successfully reach Mars after the Soviet Union, [[NASA]] (USA) and [[ESA]] (Europe). It was completed in a record low budget of $71 million,<ref name="ibtimes20131105">{{cite news |url=http://www.ibtimes.co.in/india-successfully-launches-first-mission-to-mars-pm-congratulates-isro-team-photos-519719 |title=India Successfully Launches First Mission to Mars; PM Congratulates ISRO Team |work=[[International Business Times]] |date=5 November 2013 |access-date=13 October 2014 |archive-date=4 March 2020 |archive-url=https://web.archive.org/web/20200304092058/https://www.ibtimes.co.in/india-successfully-launches-first-mission-to-mars-pm-congratulates-isro-team-photos-519719 |url-status=live }}</ref><ref name="ndtv20131105">{{cite news |url=http://www.ndtv.com/article/cheat-sheet/india-s-450-crore-mission-to-mars-to-begin-today-10-facts-441410 |title=India's 450-crore mission to Mars to begin today: 10 facts |work=[[NDTV]] |first=Abhinav |last=Bhatt |date=5 November 2013 |access-date=13 October 2014 |archive-date=20 October 2014 |archive-url=https://web.archive.org/web/20141020040954/http://www.ndtv.com/article/cheat-sheet/india-s-450-crore-mission-to-mars-to-begin-today-10-facts-441410 |url-status=live }}</ref> making it the least-expensive Mars mission to date.<ref name="csmon20131105">{{cite news |url=http://www.csmonitor.com/World/Asia-South-Central/2013/1105/India-s-Mars-mission-worth-the-cost-video |title=India's Mars mission: worth the cost? |work=[[The Christian Science Monitor]] |first=Shivam |last=Vij |date=5 November 2013 |access-date=13 October 2014 |archive-date=5 July 2017 |archive-url=https://web.archive.org/web/20170705133836/https://www.csmonitor.com/World/Asia-South-Central/2013/1105/India-s-Mars-mission-worth-the-cost-video |url-status=live }}</ref> The mission concluded on September 27, 2022, after contact was lost.

====''InSight'' and ''MarCO''====
{{main|InSight}}
In August 2012, NASA selected ''[[InSight]]'', a $425 million lander mission with a heat flow probe and seismometer, to determine the deep interior structure of Mars.<ref>[https://www.washingtonpost.com/national/health-science/nasa-will-send-robot-drill-to-mars-in-2016/2012/08/20/43bf1980-eaef-11e1-9ddc-340d5efb1e9c_story.html NASA will send robot drill to Mars in 2016] {{Webarchive|url=https://web.archive.org/web/20180619214132/https://www.washingtonpost.com/national/health-science/nasa-will-send-robot-drill-to-mars-in-2016/2012/08/20/43bf1980-eaef-11e1-9ddc-340d5efb1e9c_story.html |date=2018-06-19 }}, Washington Post, By Brian Vastag, Monday, August 20</ref><ref name="usra3">[http://www.lpi.usra.edu/meetings/marsconcepts2012/ Concepts and Approaches for Mars Exploration – LPI – USRA (2012)] {{Webarchive|url=https://web.archive.org/web/20120811065633/http://www.lpi.usra.edu/meetings/marsconcepts2012/ |date=2012-08-11 }}. Lpi.usra.edu. Retrieved on 2012-05-10.</ref><ref name="missionpg">{{cite web| title=InSight: Mission| url=http://insight.jpl.nasa.gov/mission/| archive-url=https://web.archive.org/web/20120111014040/http://insight.jpl.nasa.gov/mission/| url-status=dead| archive-date=11 January 2012|website=Mission Website| publisher=[[NASA]]'s [[Jet Propulsion Laboratory]]|access-date=7 December 2011}}</ref> ''InSight'' landed successfully on Mars on 26 November 2018.<ref>{{cite news |last=Chang |first=Kenneth |title=Mars InSight Landing: Follow NASA's Return to the Red Planet - The NASA spacecraft will arrive at the red planet today and attempt to reach its surface in one piece. |url=https://www.nytimes.com/2018/11/26/science/nasa-insight-mars-landing.html |date=26 November 2018 |work=The New York Times |access-date=26 November 2018 |archive-date=21 May 2019 |archive-url=https://web.archive.org/web/20190521153154/https://www.nytimes.com/2018/11/26/science/nasa-insight-mars-landing.html |url-status=live }}</ref> Valuable data on the atmosphere,<ref>{{Cite journal |last1=Banfield |first1=Don |last2=Spiga |first2=Aymeric |last3=Newman |first3=Claire |last4=Forget |first4=François |last5=Lemmon |first5=Mark |last6=Lorenz |first6=Ralph |last7=Murdoch |first7=Naomi |last8=Viudez-Moreiras |first8=Daniel |last9=Pla-Garcia |first9=Jorge |last10=Garcia |first10=Raphaël F. |last11=Lognonné |first11=Philippe |last12=Karatekin |first12=Özgür |last13=Perrin |first13=Clément |last14=Martire |first14=Léo |last15=Teanby |first15=Nicholas |title=The atmosphere of Mars as observed by InSight |url=http://oro.open.ac.uk/69503/1/InSight_Atmospheres_Overview_Accepted.pdf |journal=Nature Geoscience |date=2020-02-24 |language=en |volume=13 |issue=3 |pages=190–198 |doi=10.1038/s41561-020-0534-0 |bibcode=2020NatGe..13..190B |s2cid=211265854 |issn=1752-0908}}</ref> surface<ref>{{Cite journal |last1=Garcia |first1=Raphael F. |last2=Daubar |first2=Ingrid J. |last3=Beucler |first3=Éric |last4=Posiolova |first4=Liliya V. |last5=Collins |first5=Gareth S. |last6=Lognonné |first6=Philippe |last7=Rolland |first7=Lucie |last8=Xu |first8=Zongbo |last9=Wójcicka |first9=Natalia |last10=Spiga |first10=Aymeric |last11=Fernando |first11=Benjamin |last12=Speth |first12=Gunnar |last13=Martire |first13=Léo |last14=Rajšić |first14=Andrea |last15=Miljković |first15=Katarina |title=Newly formed craters on Mars located using seismic and acoustic wave data from InSight |url=https://www.nature.com/articles/s41561-022-01014-0 |journal=Nature Geoscience |date=2022-09-19 |language=en |volume=15 |issue=10 |pages=774–780 |doi=10.1038/s41561-022-01014-0 |bibcode=2022NatGe..15..774G |hdl=10044/1/98460 |s2cid=252396844 |issn=1752-0908|hdl-access=free }}</ref> and the planet's interior<ref>{{Cite journal |last1=Huang |first1=Quancheng |last2=Schmerr |first2=Nicholas C. |last3=King |first3=Scott D. |last4=Kim |first4=Doyeon |last5=Rivoldini |first5=Attilio |last6=Plesa |first6=Ana-Catalina |last7=Samuel |first7=Henri |last8=Maguire |first8=Ross R. |last9=Karakostas |first9=Foivos |last10=Lekić |first10=Vedran |last11=Charalambous |first11=Constantinos |last12=Collinet |first12=Max |last13=Myhill |first13=Robert |last14=Antonangeli |first14=Daniele |last15=Drilleau |first15=Mélanie |date=2022-10-18 |title=Seismic detection of a deep mantle discontinuity within Mars by InSight |journal=Proceedings of the National Academy of Sciences |language=en |volume=119 |issue=42 |pages=e2204474119 |doi=10.1073/pnas.2204474119 |doi-access=free |issn=0027-8424 |pmc=9586319 |pmid=36215469|bibcode=2022PNAS..11904474H }}</ref> were gathered by Insight. Insight's mission was declared as ended on 21 December 2022.

Two flyby [[CubeSat]]s called [[Mars Cube One|MarCO]] were launched with ''InSight'' on 5 May 2018<ref name="InSight launch">{{cite news|last1=Chang|first1=Kenneth|title=NASA's Mars InSight Mission Launches for Six-Month Journey|url=https://www.nytimes.com/2018/05/05/science/nasa-mars-insight-launch.html|access-date=7 May 2018|work=The New York Times|date=5 May 2018|archive-date=19 May 2019|archive-url=https://web.archive.org/web/20190519094320/https://www.nytimes.com/2018/05/05/science/nasa-mars-insight-launch.html|url-status=live}}</ref> to provide real-time telemetry during the entry and landing of ''InSight''. The CubeSats separated from the Atlas V booster 1.5 hours after launch and traveled their own trajectories to Mars.<ref>{{Cite web|title = NASA Prepares for First Interplanetary CubeSat Mission|url = http://www.nasa.gov/press-release/nasa-prepares-for-first-interplanetary-cubesats-on-agency-s-next-mission-to-mars|access-date = 2015-06-12|date = 2015-06-12|archive-date = 2015-06-15|archive-url = https://web.archive.org/web/20150615003203/http://www.nasa.gov/press-release/nasa-prepares-for-first-interplanetary-cubesats-on-agency-s-next-mission-to-mars/|url-status = live}}</ref><ref>{{Cite web |title = The CubeSat Era in Space |website = [[Jet Propulsion Laboratory]] |url = http://www.jpl.nasa.gov/cubesat/missions/marco.php |access-date = 2015-08-20 |archive-date = 2015-08-12 |archive-url = https://web.archive.org/web/20150812043850/http://www.jpl.nasa.gov/cubesat/missions/marco.php |url-status = live }}</ref><ref>{{Cite web| title = InSight| url = http://www.nasa.gov/mission_pages/insight/main/index.html| access-date = 2015-06-12| date = 2015-02-23| archive-date = 2015-06-13| archive-url = https://web.archive.org/web/20150613223152/http://www.nasa.gov/mission_pages/insight/main/index.html| url-status = live}}</ref>

== Current missions ==
[[File:PIA24838-NASA-MarsMissions-20210928.jpg|thumb|upright=2|NASA missions to Mars (28 September 2021)(''Perseverance'' rover; ''Ingenuity'' Mars helicopter; ''InSight'' lander; ''Odyssey'' orbiter; ''MAVEN'' orbiter; ''Curiosity'' rover; ''Mars Reconnaissance Orbiter'')]]
On 10 March 2006, NASA's ''[[Mars Reconnaissance Orbiter]]'' (MRO) probe arrived in orbit to conduct a two-year science survey. The orbiter began mapping the Martian terrain and weather to find suitable landing sites for upcoming lander missions. The MRO captured the first image of a series of active [[avalanche]]s near the planet's north pole in 2008.<ref name="cnn_avalanche">{{cite news|url=http://edition.cnn.com/2008/TECH/space/03/03/mars.avalanche.ap/index.html|title=Photo shows avalanche on Mars|work=CNN|access-date=2008-03-04 |archive-url = https://web.archive.org/web/20080419070652/http://edition.cnn.com/2008/TECH/space/03/03/mars.avalanche.ap/index.html |archive-date = April 19, 2008|url-status=dead}}</ref>

The [[Mars Science Laboratory]] mission was launched on November 26, 2011, and delivered the [[Curiosity rover|''Curiosity'' rover]] on the surface of Mars on August 6, 2012 [[UTC]]. It is larger and more advanced than the Mars Exploration Rovers, with a velocity of up to 90 [[Metre per hour|meters per hour]] (295 feet per hour).<ref name="home">{{cite web |title=Mars Science Laboratory&nbsp;– Homepage |url=http://marsprogram.jpl.nasa.gov/msl/overview/ |url-status=dead |archive-url=https://web.archive.org/web/20090730122143/http://marsprogram.jpl.nasa.gov/msl/overview/ |archive-date=2009-07-30 |access-date=2012-08-25 |publisher=NASA}}</ref> Experiments include a laser chemical sampler that can deduce the composition of rocks at a distance of 7 meters.<ref name="laser">{{cite web |url=http://mars.jpl.nasa.gov/msl/mission/instruments/spectrometers/chemcam/ |title=Chemistry and Cam (ChemCam) |publisher=NASA |access-date=2012-08-25 |archive-date=2021-08-26 |archive-url=https://web.archive.org/web/20210826071022/https://mars.nasa.gov/msl/spacecraft/instruments/chemcam/ |url-status=live }}</ref>

[[MAVEN]] orbiter was launched on 18 November 2013, and on 22 September 2014, it was injected into an areocentric elliptic orbit 6,200&nbsp;km (3,900&nbsp;mi) by 150&nbsp;km (93&nbsp;mi) above the planet's surface to study its atmosphere. Mission goals include determining how the planet's atmosphere and water, presumed to have once been substantial, were lost over time.<ref name="NASA-20140921">{{cite web |last1=Brown |first1=Dwayne |last2=Neal-Jones |first2=Nancy |last3=Zubritsky |first3=Elizabeth |title=NASA's Newest Mars Mission Spacecraft Enters Orbit around Red Planet |url=http://www.jpl.nasa.gov/news/news.php?release=2014-318 |date=September 21, 2014 |work=[[NASA]] |access-date=September 22, 2014 |archive-date=January 20, 2017 |archive-url=https://web.archive.org/web/20170120141427/http://www.jpl.nasa.gov/news/news.php?release=2014-318 |url-status=live }}</ref>

The ''[[ExoMars Trace Gas Orbiter]]'' arrived at Mars in 2016 and deployed the [[Schiaparelli EDM lander]], a test lander. Schiaparelli crashed on surface, but it transmitted key data during its parachute descent, so the test was declared a partial success.<ref name="ESA-20161019">{{cite news |url=http://m.esa.int/Our_Activities/Space_Science/ExoMars/ExoMars_TGO_reaches_Mars_orbit_while_EDM_situation_under_assessment |title=ExoMars TGO reaches Mars orbit while EDM situation under assessment |work=ESA press release |date=19 October 2016 |access-date=19 October 2016 |archive-url=https://web.archive.org/web/20161020105758/http://m.esa.int/Our_Activities/Space_Science/ExoMars/ExoMars_TGO_reaches_Mars_orbit_while_EDM_situation_under_assessment |archive-date=20 October 2016 |url-status=dead }}</ref><!-- this mission is still on-going, despite the fact that the lander was destroyed. More information should be added -->

=== Overview of missions ===
====''Mars Reconnaissance Orbiter''====
{{Main|Mars Reconnaissance Orbiter}}
[[File:PIA22240slopstreaks.jpg|thumb|left|Slope streaks as seen by HiRISE<ref>{{cite web | url=https://photojournal.jpl.nasa.gov/catalog/PIA22240 | title=Catalog Page for PIA22240 | access-date=2018-02-09 | archive-date=2020-07-29 | archive-url=https://web.archive.org/web/20200729014701/https://photojournal.jpl.nasa.gov/catalog/PIA22240 | url-status=live }}</ref>]]
The ''Mars Reconnaissance Orbiter'' (MRO) is a multipurpose spacecraft designed to conduct [[reconnaissance]] and exploration of Mars from orbit. The US$720 million spacecraft was built by [[Lockheed Martin]] under the supervision of the [[Jet Propulsion Laboratory]], launched August 12, 2005, and entered Mars orbit on March 10, 2006.<ref name="spaceflightnow1">{{cite web| url=http://spaceflightnow.com/mars/mro/status.html| title="Spaceflight Now" MRO Mission Status Center| access-date=23 October 2016| archive-date=11 June 2016| archive-url=https://web.archive.org/web/20160611101921/http://spaceflightnow.com/mars/mro/status.html| url-status=live}}</ref>

The MRO contains a host of scientific instruments such as the [[HiRISE]] camera, CTX camera, CRISM, and [[SHARAD]]. The HiRISE camera is used to analyze Martian landforms, whereas CRISM and SHARAD can detect [[water]], [[ice]], and [[minerals]] on and below the surface. Additionally, MRO is paving the way for upcoming generations of spacecraft through daily monitoring of Martian weather and surface conditions, searching for future landing sites, and testing a new telecommunications system that enable it to send and receive information at an unprecedented [[bitrate]], compared to previous Mars spacecraft. [[Data transfer]] to and from the spacecraft occurs faster than all previous interplanetary missions combined and allows it to serve as an important relay satellite for other missions.{{citation needed|date=December 2015}}

==== ''Curiosity'' rover ====
{{main|Mars Science Laboratory|Curiosity rover|Timeline of Mars Science Laboratory}}
[[File:Curiosity Self-Portrait at 'Big Sky' Drilling Site.jpg|thumb|upright|A self-portrait of the [[Curiosity (rover)|''Curiosity'' rover]], which landed on Mars in 2012]]
The NASA [[Mars Science Laboratory]] mission with its rover named ''[[Curiosity rover|Curiosity]]'', was launched on November 26, 2011,<ref>{{cite web | date=26 November 2011 | url=http://www.nasa.gov/mission_pages/msl/launch/index.html | title=Mars Science Laboratory Launch | access-date=2011-11-26 | archive-date=2017-05-20 | archive-url=https://web.archive.org/web/20170520061039/https://www.nasa.gov/mission_pages/msl/launch/index.html | url-status=live }}</ref><ref name="NYT-MSL">{{cite news|agency=Associated Press |title=NASA Launches Super-Size Rover to Mars: 'Go, Go!'|url=https://www.nytimes.com/aponline/2011/11/26/science/AP-US-SCI-Mars-Rover.html|work=The New York Times|date=26 November 2011|access-date=2011-11-26}}</ref> and landed on Mars on August 6, 2012, on [[Aeolis Palus]] in [[Gale (crater)|Gale Crater]]. The rover carries instruments designed to look for past or present conditions relevant to the past or present [[Planetary habitability|habitability]] of Mars.<ref name="IAU-20120516">{{cite web| author=USGS| title=Three New Names Approved for Features on Mars| url=https://astrogeology.usgs.gov/HotTopics/index.php?/archives/447-Three-New-Names-Approved-for-Features-on-Mars.html| date=16 May 2012| publisher=[[USGS]]| access-date=28 May 2012| archive-url=https://web.archive.org/web/20120728141903/http://astrogeology.usgs.gov/HotTopics/index.php?%2Farchives%2F447-Three-New-Names-Approved-for-Features-on-Mars.html| archive-date=28 July 2012| url-status=dead}}</ref><ref name="NASA-20120327">{{cite web|title='Mount Sharp' on Mars Compared to Three Big Mountains on Earth|url=http://www.nasa.gov/mission_pages/msl/multimedia/pia15292-Fig2.html|date=27 March 2012|publisher=NASA|access-date=31 March 2012|archive-date=7 May 2017|archive-url=https://web.archive.org/web/20170507134815/https://www.nasa.gov/mission_pages/msl/multimedia/pia15292-Fig2.html|url-status=live}}</ref><ref name="NASA-20120328">{{cite web |last=Agle |first=D. C. |title='Mount Sharp' On Mars Links Geology's Past and Future |url=http://www.nasa.gov/mission_pages/msl/news/msl20120328.html |date=28 March 2012 |publisher=[[NASA]] |access-date=31 March 2012 |archive-date=6 March 2017 |archive-url=https://web.archive.org/web/20170306035214/https://www.nasa.gov/mission_pages/msl/news/msl20120328.html |url-status=live }}</ref><ref name="Space-20120329">{{cite web| title=NASA's New Mars Rover Will Explore Towering 'Mount Sharp'| url=http://www.space.com/15097-mars-mountain-sharp-curiosity-rover.html| date=29 March 2012| publisher=[[Space.com]]| access-date=30 March 2012| archive-date=23 August 2016| archive-url=https://web.archive.org/web/20160823211409/http://www.space.com/15097-mars-mountain-sharp-curiosity-rover.html| url-status=live}}</ref>

====MAVEN====
NASA's [[MAVEN]] is an orbiter mission to study the upper atmosphere of Mars.<ref name="nasa_maven">{{cite web|url=http://www.nasa.gov/mission_pages/mars/news/maven_20080915.html|title=NASA Selects 'MAVEN' Mission to Study Mars Atmosphere|publisher=Nasa|access-date=2009-09-20|archive-date=2009-06-19|archive-url=https://web.archive.org/web/20090619181039/http://www.nasa.gov/mission_pages/mars/news/maven_20080915.html|url-status=live}}</ref> It also serves as a communications relay satellite for robotic landers and rovers on the surface of Mars. MAVEN was launched 18 November 2013 and reached Mars on 22 September 2014.{{citation needed|date=December 2015}}

====Trace Gas Orbiter and EDM====
{{main|Trace Gas Orbiter|Schiaparelli EDM lander}}
The ExoMars [[Trace Gas Orbiter]] is an atmospheric research orbiter built in collaboration between ESA and Roscosmos. It was injected into Mars orbit on 19 October 2016 to gain a better understanding of [[Methane on Mars|methane]] ({{chem|C|H|4}}) and other trace gases present in the Martian atmosphere that could be evidence for possible biological or geological activity. The Schiaparelli EDM lander was destroyed when trying to land on the surface of Mars.<ref name="NYT-20161019">{{cite news |last=Chang |first=Kenneth |title=ExoMars Mission to Join Crowd of Spacecraft at Mars |url=https://www.nytimes.com/2016/10/20/science/esa-mars-lander.html |date=19 October 2016 |work=[[The New York Times]] |access-date=19 October 2016 |archive-date=19 October 2016 |archive-url=https://web.archive.org/web/20161019174031/http://www.nytimes.com/2016/10/20/science/esa-mars-lander.html |url-status=live }}</ref>

====''Hope''====
The [[United Arab Emirates]] launched the [[Hope Mars Mission]], in July 2020 on the Japanese [[H-IIA]] booster.<ref>{{cite web|last=Gray|first=Tyler|date=26 April 2020|title=UAE-built Mars orbiter arrives at launch site ahead of July liftoff|url=https://www.nasaspaceflight.com/2020/04/uae-mars-orbiter-arrives-launch-site/|access-date=26 April 2020|work=[[NASASpaceFlight]]|archive-date=28 April 2020|archive-url=https://web.archive.org/web/20200428000110/https://www.nasaspaceflight.com/2020/04/uae-mars-orbiter-arrives-launch-site/|url-status=live}}</ref> It was successfully placed into orbit on 9 February 2021. It is studying the Martian atmosphere and weather.

====Tianwen-1 and ''Zhurong'' rover====
[[Tianwen-1]] was a Chinese mission launched on 23 July 2020 which included an orbiter, a lander, and a {{convert|240|kg|adj=on}} rover along with a package of deployable and remote cameras.<ref>{{Cite news|last=Jones|first=Andrew|date=24 April 2020|title=China's Mars mission named Tianwen-1, appears on track for July launch|work=SpaceNews|url=https://spacenews.com/chinas-mars-mission-named-tianwen-1-appears-on-track-for-july-launch/|access-date=2 May 2020}}</ref> Tianwen-1 entered orbit on 10 February 2021 and the [[Zhurong (rover)|''Zhurong'' rover]] successfully landed on 14 May 2021 and deployed on 22 May 2021.<ref name="bbc-tianwen1"/> Zhurong had been in operation for 347 Martian days and traveled 1,921 meters across Mars.<ref>{{Cite web |last=Jones |first=Andrew |date=2022-05-11 |title=China's Mars rover Zhurong is hunkering down for its 1st Red Planet winter |url=https://www.space.com/china-mars-rover-zhurong-first-winter |access-date=2023-03-07 |website=Space.com |language=en}}</ref>

====Mars 2020, ''Perseverance'' rover, ''Ingenuity'' helicopter====
[[File:Mars Sample return mission's rock samples collected by 2020 Perseverance Rover Traverse Path.png|thumb|upright=2.2|Mapping ''Perseverance''{{'s}} samples collected to date]]
The [[Mars 2020]] mission by NASA was launched on 30 July 2020 on a United Launch Alliance [[Atlas V rocket]] from [[Cape Canaveral]]. It is based on the [[Mars Science Laboratory]] design. The scientific payload is focused on [[astrobiology]].<ref>[http://www.nasa.gov/press/2014/july/nasa-announces-mars-2020-rover-payload-to-explore-the-red-planet-as-never-before/ NASA Announces Mars 2020 Rover Payload to Explore the Red Planet as Never Before] {{Webarchive|url=https://web.archive.org/web/20190401132556/https://www.nasa.gov/press/2014/july/nasa-announces-mars-2020-rover-payload-to-explore-the-red-planet-as-never-before/ |date=2019-04-01 }}. July 31, 2014.</ref> It includes the [[Perseverance (rover)|''Perseverance'']] rover and the retired [[Ingenuity (helicopter)|''Ingenuity'']] helicopter. Unlike older rovers that relied on solar power, ''Perseverance'' is nuclear powered, to survive longer than its predecessors in this harsh, dusty environment. The car-size rover weighs about 1 ton, with a robotic arm that reaches about {{convert|7|ft}}, zoom cameras, a chemical analyzer and a rock drill.<ref>{{cite web | url= https://www.usatoday.com/story/news/nation/2021/02/18/mars-rover-landing-2021-nasa-perseverance-livestream-how-watch/6784360002/ | title= Perseverance rover | publisher= [[usatoday.com]] | access-date= 20 Feb 2021 | archive-date= 19 February 2021 | archive-url= https://web.archive.org/web/20210219173739/https://www.usatoday.com/story/news/nation/2021/02/18/mars-rover-landing-2021-nasa-perseverance-livestream-how-watch/6784360002/ | url-status= live }}</ref><ref>{{cite web | url= https://www.cnbc.com/2021/02/18/mars-landing-nasas-perseverance-rover-lands-successfully-on-surface.html#:~:text=NASA%20plans%20to%20drive%20Perseverance,to%20687%20days%20on%20Earth.&text=%E2%80%9CPerseverance%20is%20the%20first%20rover,said%20in%20a%20press%20release. | title= NASA lands Perseverance rover on the Mars surface | date= 18 February 2021 | publisher= [[cnbc.com]] | access-date= 20 Feb 2021 | archive-date= 19 February 2021 | archive-url= https://web.archive.org/web/20210219200110/https://www.cnbc.com/2021/02/18/mars-landing-nasas-perseverance-rover-lands-successfully-on-surface.html#:~:text=NASA%20plans%20to%20drive%20Perseverance,to%20687%20days%20on%20Earth.&text=%E2%80%9CPerseverance%20is%20the%20first%20rover,said%20in%20a%20press%20release. | url-status= live }}</ref>

After traveling 293 million miles (471 million km) to reach Mars over the course of more than six months, ''Perseverance'' successfully landed on February 18, 2021. Its initial mission is set for at least one Martian year, or 687 Earth days. It will search for signs of ancient life and explore the red planet's surface.<ref>{{cite web| url= https://www.foxnews.com/science/nasas-perseverance-rover-lands-on-mars| title= TNASA's Perseverance rover lands on Mars| date= 18 February 2021| publisher= [[foxnews.com]]| access-date= 18 Feb 2021| archive-date= 18 February 2021| archive-url= https://web.archive.org/web/20210218221316/https://www.foxnews.com/science/nasas-perseverance-rover-lands-on-mars| url-status= live}}</ref><ref>{{cite web | url=https://www.space.com/perseverance-mars-rover-landing-success | title=The most advanced robot ever sent to Mars has landed successfully | date=18 February 2021 | publisher=[[Space.com]] | access-date=18 Feb 2021 | archive-date=18 February 2021 | archive-url=https://web.archive.org/web/20210218211946/https://www.space.com/perseverance-mars-rover-landing-success | url-status=live }}</ref>

As of October 19, 2021, ''Perseverance'' had captured the first sounds from Mars. Recordings consisted of five hours of Martian wind gusts, rover wheels crunching over gravel, and motors whirring as the spacecraft moves its arm. The sounds give researchers clues about the atmosphere, such as how far sound travels on the planet.{{citation needed|date=October 2021}}
====Europa Clipper, Hera and Psyche====
The [[NASA]] [[Europa Clipper]] to [[Jupiter]] and [[Europa (moon)|Europa]], [[NASA]] [[Psyche (spacecraft)|''Psyche'']] space probe mission to the metal-rich asteroid [[16 Psyche]] and [[ESA]] [[Hera (spacecraft)|''Hera'']] to [[65803 Didymos|Didymos]] will undertake flybys of Mars on March 1, 2025,<ref>{{cite web |title=Eyes of the Solar Sytem |url=https://eyes.nasa.gov/apps/solar-system/#/sc_europa_clipper/distance?rate=0&time=2025-03-01T17:56:54.943+00:00&to=mars |website=Eyes of the Solar System |publisher=NASA/JPL |access-date=November 5, 2024}}</ref> March 2025, and May 2026 respectively, in a [[gravitational slingshot]] designed to slow and redirect the spacecraft.<ref>{{cite web | url=https://amp.cnn.com/cnn/2023/10/13/world/psyche-metal-asteroid-nasa-launch-scn/index.html | title=NASA launches a spacecraft to visit Psyche, an unseen metal world | date=October 13, 2023 }}</ref>

== Future missions ==
{{See also|Mars sample return mission}}
* [[EscaPADE|EscaPADE (Escape and Plasma Acceleration and Dynamics Explorers)]] by the University of California, Berkeley, is a planned twin-spacecraft [[NASA]] Mars orbiter mission to study the structure, composition, variability and dynamics of Mars' magnetosphere and atmospheric escape processes.<ref name="EscaPADE A, B (SIMPLEx 4)">{{cite news |url=https://space.skyrocket.de/doc_sdat/escapade.htm |title=EscaPADE A, B (SIMPLEx 4)n |work=Agence France-Presse |publisher=Guntr's Space Page |access-date=2021-04-07 |archive-date=2021-03-03 |archive-url=https://web.archive.org/web/20210303160040/https://space.skyrocket.de/doc_sdat/escapade.htm |url-status=live }}</ref> The EscaPADE orbiters were originally to be launched in 2022 as secondary payloads on a [[Falcon Heavy]] together with the [[Psyche (spacecraft)|Psyche]] and Janus missions, but will now be launched on a [[New Glenn]].<ref>{{Cite web |last=Foust |first=Jeff |date=2023-04-13 |title=ESCAPADE confident in planned 2024 New Glenn launch |url=https://spacenews.com/escapade-confident-in-planned-2024-new-glenn-launch/ |access-date=2023-11-09 |website=SpaceNews |language=en-US}}</ref> The mission is scheduled to launch in Q2 for 2025.
* India's [[ISRO]] plans to send a follow-up mission to its [[Mars Orbiter Mission]] in 2026; it is called [[Mars Lander Mission]] and it will consist of an orbiter and a lander.<ref name=space2024>{{Cite web|url=https://www.space.com/india-mangalyaan-2-mars-mission-rover-helicopter-sky-crane|title=India's ambitious 2nd Mars mission to include a rover, helicopter, sky crane and a supersonic parachute|first=Sharmila |last=Kuthunur |date=17 May 2024|website=Space.com}}</ref>
* As part of the [[ExoMars]] program, [[ESA]] and the [[Roscosmos]] planned to send the [[Rosalind Franklin (rover)|''Rosalind Franklin'' rover]] in 2022 to search for evidence of past or present microscopic [[life on Mars]].<ref name="Delaying 2018">{{cite news |url=http://www.industryweek.com/emerging-technologies/money-troubles-may-delay-europe-russia-mars-mission |title=Money Troubles May Delay Europe-Russia Mars Mission |work=Agence France-Presse |publisher=Industry Week |date=15 January 2016 |access-date=2016-01-16 |archive-date=2020-02-01 |archive-url=https://web.archive.org/web/20200201184900/http://www.industryweek.com/emerging-technologies/money-troubles-may-delay-europe-russia-mars-mission |url-status=live }}</ref> The lander that was planned to deliver the rover is called ''[[Kazachok]]'', and it would have performed scientific studies for about 2 years. This mission had been delayed indefinitely as a result of the [[2022 Russian invasion of Ukraine]].<ref>{{cite web |title=Delay of ExoMars rover launch |url=https://www.space.com/europe-suspends-exomars-mars-rover-launch-russia |website=Space.com |date=17 March 2022 |access-date=1 April 2022}}</ref> in 2024, the mission received additional funding and is now planned for launch in 2028.<ref>{{Cite web |last=Foust |first=Jeff |date=2024-04-10 |title=ESA awards contract to Thales Alenia Space to restart ExoMars |url=https://spacenews.com/esa-awards-contract-to-thales-alenia-space-to-restart-exomars/ |access-date=2024-04-29 |website=SpaceNews |language=en-US}}</ref>

===Proposals===
* [[Tianwen-3]] is a Chinese mission to return samples of Martian soil to Earth.<ref>{{Cite web |last=Jones |first=Andrew |date=2022-05-18 |title=China to launch Tianwen 2 asteroid-sampling mission in 2025 |url=https://www.space.com/china-tianwen2-asteroid-sampling-mission-2025-launch |access-date=2022-05-20 |website=Space.com |language=en}}</ref> The mission would launch in late 2028, with a lander and ascent vehicle and an orbiter and return module launched separately on two rockets. The samples would be returned to Earth by July 2031.<ref>{{Cite web |last=Jones |first=Andrew |date=2022-06-20 |title=China aims to bring Mars samples to Earth 2 years before NASA, ESA mission |url=https://spacenews.com/china-aims-to-bring-mars-samples-to-earth-2-years-before-nasa-esa-mission/ |access-date=2022-06-21 |website=SpaceNews |language=en-US}}</ref>
* [[NASA-ESA Mars Sample Return]] is a three-launch architecture concept for a sample return mission, which uses a rover to cache small samples, a Mars ascent stage to send it into orbit, and an orbiter to rendezvous with it above Mars and take it to Earth.<ref name="autogenerated1">[http://sites.nationalacademies.org/SSB/SSB_059331 Planetary Science Decadal Survey Mission & Technology Studies] {{Webarchive|url=https://web.archive.org/web/20171218140247/http://sites.nationalacademies.org/SSB/SSB_059331 |date=2017-12-18 }}. Sites.nationalacademies.org. Retrieved on 2012-05-10.</ref> Solar-electric propulsion could allow a one launch sample return instead of three.<ref name="archive">Oh, David Y. ''et al.'' (2009) [[iarchive:singlelauncharchitecture|Single Launch Architecture for Potential Mars Sample Return Mission Using Electric Propulsion]]. JPL/Caltech.</ref>
* The [[Mars-Grunt]] is a Russian mission concept to bring a sample of [[Martian soil]] to Earth.<ref name="day">{{cite web |author=Day, Dwayne A. |date=2011-11-28 |title=Red Planet blues |url=http://www.thespacereview.com/article/1980/1 |url-status=live |archive-url=https://web.archive.org/web/20120419061222/http://www.thespacereview.com/article/1980/1 |archive-date=2012-04-19 |access-date=2012-01-16 |publisher=The Space Review}}</ref>
* [[Mars Aerial and Ground Global Intelligent Explorer (MAGGIE)]] – is a proposed compact fixed wing [[electric aircraft]] powered by [[solar energy]] to fly in the Martian atmosphere with [[VTOL|vertical take-off/landing]] ([[VTOL]]) capability.<ref>{{Cite web|url=https://www.nasa.gov/general/mars-aerial-and-ground-global-intelligent-explorer/|title=Mars Aerial and Ground Global Intelligent Explorer (MAGGIE) - NASA|date=January 4, 2024}}</ref>

Other future mission concepts include polar probes, Martian aircraft and a network of small meteorological stations.<ref name=autogenerated1 /> Longterm areas of study may include Martian lava tubes, resource utilization, and electronic charge carriers in rocks.<ref name="nasa5">[http://solarsystem.nasa.gov/2013decadal/whitepapers.cfm?Display=Table&Category=WP&RestrictFields=Author,CoAuthors,Title,Summary,PanelSelection,Institution&Sort=Author&SortDir=ASC&ShowAll=1 Decadal Survey Document Listing: White Papers] {{webarchive|url=https://web.archive.org/web/20130514053429/http://solarsystem.nasa.gov/2013decadal/whitepapers.cfm?Display=Table&Category=WP&RestrictFields=Author,CoAuthors,Title,Summary,PanelSelection,Institution&Sort=Author&SortDir=ASC&ShowAll=1 |date=2013-05-14 }} (NASA)</ref><ref name="nasa6">[http://mars.jpl.nasa.gov/programmissions/missions/missiontypes/balloons/ Balloons – NASA] {{Webarchive|url=https://web.archive.org/web/20120812000957/http://mars.jpl.nasa.gov/programmissions/missions/missiontypes/balloons/ |date=2012-08-12 }}. Mars.jpl.nasa.gov. Retrieved on 2012-05-10.</ref>

==Human mission proposals==
[[File:Mars-manned-mission-NASA-V5.jpg|thumb|upright=1.8|Concept for NASA Design Reference Mission Architecture 5.0 (2009)]]
{{Main|Human mission to Mars}}
The human exploration of Mars has been an aspiration since the earliest days of modern rocketry; [[Robert H. Goddard]] credits the idea of reaching Mars as his own inspiration to study the physics and engineering of space flight.<ref>{{cite web |last1=Stern |first1=David |title=Robert Goddard and His Rockets |url=https://www-istp.gsfc.nasa.gov/stargaze/Sgoddard.htm |publisher=NASA Goddard Space Flight Center |access-date=21 November 2019 |archive-date=17 March 2020 |archive-url=https://web.archive.org/web/20200317070107/https://www-istp.gsfc.nasa.gov/stargaze/Sgoddard.htm |url-status=live }}</ref> Proposals for human exploration of Mars have been made [[Human mission to Mars#20th century|throughout the history of space exploration]]. Currently there are multiple active plans and programs to put humans on Mars within the next ten to thirty years, both governmental and private, some of which are listed below.

===NASA===
Human exploration by the United States was identified as a long-term goal in the [[Vision for Space Exploration]] announced in 2004 by then US President [[George W. Bush]].<ref name=britt_bush_vision/> The planned ''[[Orion (Constellation program)|Orion]]'' spacecraft would be used to send a human expedition to Earth's moon by 2020 as a stepping stone to a Mars expedition. On September 28, 2007, NASA administrator [[Michael D. Griffin]] stated that NASA aims to put a person on Mars by 2037.<ref name=mars_daily/>

On December 2, 2014, NASA's Advanced Human Exploration Systems and Operations Mission Director Jason Crusan and Deputy Associate Administrator for Programs James Reuthner announced tentative support for the [[Boeing]] "Affordable Mars Mission Design" including radiation shielding, centrifugal artificial gravity, in-transit consumable resupply, and a lander which can return.<ref>K. Klaus, M. L. Raftery and K. E. Post (2014), [http://www.hou.usra.edu/meetings/lpsc2014/eposter/2258 "An Affordable Mars Mission Design"], {{webarchive|url=https://web.archive.org/web/20150507235406/http://www.hou.usra.edu/meetings/lpsc2014/eposter/2258|date=2015-05-07}}, (Houston, Texas: Boeing Company).</ref><ref>{{cite report|first=M. L. |last=Raftery |date=May 14, 2014 |url=https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=35115.0;attach=591344 |title=Mission to Mars in Six (not so easy) Pieces|access-date=February 11, 2023|publisher=Boeing Co.}}</ref> Reuthner suggested that if adequate funding was forthcoming, the proposed mission would be expected in the early 2030s.<ref>NASA (December 2, 2014) [https://www.youtube.com/watch?v=zBoj-1m-qLU "NASA's Journey to Mars News Briefing"] {{Webarchive|url=https://web.archive.org/web/20150517215929/https://www.youtube.com/watch?v=zBoj-1m-qLU |date=2015-05-17 }} ''NASA TV''</ref>

[[File:NASA-JourneyToMars-ScienceExplorationTechnology-20141202.jpg|thumb|upright=2.8|Journey to Mars – Science, Exploration, Technology]]
On October 8, 2015, [[NASA]] published its official plan for human exploration and colonization of Mars. They called it "Journey to Mars". The plan operates through three distinct phases leading to fully sustained colonization.<ref>{{Cite web|title = NASA Releases Plan Outlining Next Steps in the Journey to Mars|url = http://www.nasa.gov/press-release/nasa-releases-plan-outlining-next-steps-in-the-journey-to-mars|website = NASA|access-date = 2015-10-12|first = Erin|last = Mahoney|date = 2015-09-24|archive-date = 2015-10-12|archive-url = https://web.archive.org/web/20151012080355/http://www.nasa.gov/press-release/nasa-releases-plan-outlining-next-steps-in-the-journey-to-mars/|url-status = live}}</ref>
* The first stage, already underway, is the "Earth Reliant" phase. This phase continues using the [[International Space Station]] until 2024; validating deep space technologies and studying the effects of long-duration space missions on the human body.  
* The second stage, "Proving Ground," moves away from Earth reliance and ventures into [[cislunar space]] for most of its tasks. This is when NASA plans to capture an asteroid, test deep space habitation facilities, and validate the capabilities required for human exploration of Mars.
* The last stage, the "Earth Independent" phase, includes long-term missions on the lunar surface which leverage surface habitats that only require routine maintenance, and the harvesting of Martian resources for fuel, water, and building materials. NASA is still aiming for human missions to Mars in the 2030s, though Earth independence could take decades longer.<ref>{{Cite web|url = http://www.nasa.gov/sites/default/files/atoms/files/journey-to-mars-next-steps-20151008_508.pdf|title = NASA's Journey To Mars: Pioneering Next Steps in Space Exploration|date = October 8, 2015|access-date = October 10, 2015|website = www.nasa.gov|publisher = NASA|archive-date = October 11, 2015|archive-url = https://web.archive.org/web/20151011075743/http://www.nasa.gov/sites/default/files/atoms/files/journey-to-mars-next-steps-20151008_508.pdf|url-status = live}}</ref>

On August 28, 2015, NASA funded a year-long simulation to study the effects of a year-long Mars mission on six scientists. The scientists lived in a biodome on a Mauna Loa mountain in Hawaii with limited connection to the outside world and were only allowed outside if they were wearing spacesuits.<ref>{{Cite web |author=Griffiths |first=James |date=29 August 2016 |title=Mars simulation crew 'return to Earth' after 365 days in isolation |url=http://www.cnn.com/2016/08/28/health/mars-simulation-hawaii/index.html |url-status=live |archive-url=https://web.archive.org/web/20160829043121/http://www.cnn.com/2016/08/28/health/mars-simulation-hawaii/index.html |archive-date=2016-08-29 |access-date=2016-08-29 |website=CNN}}</ref><ref>{{Cite news|url=https://www.theguardian.com/science/2016/aug/28/mars-scientists-nasa-dome-hawaii-mountain-isolation|title=Mars scientists leave dome on Hawaii mountain after year in isolation|last1=Slawson|first1=Nicola|date=2016-08-28|last2=agencies|newspaper=The Guardian|language=en-GB|issn=0261-3077|access-date=2016-08-29|archive-date=2016-08-28|archive-url=https://web.archive.org/web/20160828223145/https://www.theguardian.com/science/2016/aug/28/mars-scientists-nasa-dome-hawaii-mountain-isolation|url-status=live}}</ref>

NASA's human Mars exploration plans have evolved through the NASA [[Mars Design Reference Mission]]s, a series of design studies for human exploration of Mars.

In 2017, the focus of NASA shifted to a return to the Moon by 2024 with the [[Artemis program]], a flight to Mars could follow after this project.

===SpaceX===
The long-term goal of the private corporation [[SpaceX]] is the establishment of routine flights to Mars to enable colonization.<ref>{{cite web |author=Chang |first=Kenneth |date=September 27, 2016 |title=Elon Musk's Plan: Get Humans to Mars, and Beyond |url=https://www.nytimes.com/2016/09/28/science/elon-musk-spacex-mars-exploration.html |url-status=live |archive-url=https://web.archive.org/web/20180312115138/https://www.nytimes.com/2016/09/28/science/elon-musk-spacex-mars-exploration.html |archive-date=March 12, 2018 |access-date=September 18, 2019 |work=The New York Times}}</ref><ref name="2017presentation">{{Cite web|url=https://relayto.com/spacex/JNQ6SBFX/slides|title=Making Life Multi-planetary - RELAYTO/|date=2018|website=RELAYTO/|language=en|access-date=2019-09-18|archive-date=2018-04-05|archive-url=https://web.archive.org/web/20180405025308/https://relayto.com/spacex/JNQ6SBFX/slides|url-status=live}}</ref><ref>{{cite web|url=https://www.businessinsider.com/elon-musks-started-spacex-because-he-wanted-to-put-life-on-another-planet-2013-3|title=Elon Musk Decided To Put Life On Mars Because NASA Wasn't Serious Enough|first=Alyson|last=Shontell|website=Business Insider|access-date=September 18, 2019|archive-date=April 1, 2019|archive-url=https://web.archive.org/web/20190401003404/https://www.businessinsider.com/elon-musks-started-spacex-because-he-wanted-to-put-life-on-another-planet-2013-3|url-status=live}}</ref> To this end, the company is developing [[SpaceX Starship|Starship]], a spacecraft capable of crew transportation to Mars and other celestial bodies, along with its booster [[SpaceX Starship#Super Heavy booster|Super Heavy]]. In 2017 SpaceX announced plans to send two uncrewed Starships to Mars by 2022, followed by two more uncrewed flights and two crewed flights in 2024.<ref name="2017presentation" /> Neither of these have yet happened as of August 2024.

Starship is planned to have a payload of at least 100 tonnes<ref>Elon Musk on Twitter: [https://twitter.com/elonmusk/status/1131441489014394880 Aiming for 150 tons useful load in fully reusable configuration, but should be at least 100 tons, allowing for mass growth], {{Webarchive|url=https://web.archive.org/web/20190617074843/https://twitter.com/elonmusk/status/1131441489014394880|date=17 June 2019}}.</ref> and is designed to use a combination of aerobraking and propulsive descent, using fuel produced from a Mars ([[in situ resource utilization]]) facility.<ref name="2017presentation" /> As of 2024, the [[Starship development history|Starship development program]] has seen multiple integrated test flights and is progressing towards full reusability. SpaceX’s plans involve the [[mass manufacturing]] of Starship and initially sustained by resupply from Earth, and in situ resource utilization on Mars, until the Mars colony reaches full self sustainability. Any future human mission to Mars will likely take place within the optimal Mars launch window, which occurs every 26 months.<ref>{{cite web |author=Bergin |first=Chris |date=May 5, 2021 |title=Starship SN15 conducts smooth test flight and nails landing |url=https://www.nasaspaceflight.com/2021/05/starship-sn15-tests-mcgregor-raptor-testing/ |url-status=live |archive-url=https://web.archive.org/web/20210507001045/https://www.nasaspaceflight.com/2021/05/starship-sn15-tests-mcgregor-raptor-testing/ |archive-date=May 7, 2021 |access-date=May 7, 2021 |work=NasaSpaceflight.com}}</ref><ref>{{Cite web |last=Berger |first=Eric |date=2024-04-08 |title=Elon Musk just gave another Mars speech—this time the vision seems tangible |url=https://arstechnica.com/space/2024/04/elon-musk-just-gave-another-mars-speech-this-time-the-vision-seems-tangible/ |access-date=2024-04-10 |website=Ars Technica |language=en-us}}</ref>

===Zubrin===
[[Mars Direct]], a low-cost human mission proposed by [[Robert Zubrin]], founder of the [[Mars Society]], would use heavy-lift [[Saturn V]] class rockets, such as the [[Ares V]], to skip orbital construction, LEO rendezvous, and lunar fuel depots. A modified proposal, called "[[Mars to Stay]]", involves not returning the first immigrant explorers immediately, if ever (see [[Colonization of Mars]]).<ref name="britt_bush_vision">{{cite web|first=Robert|last=Britt|url=http://www.space.com/news/bush_plan_faq_040115.html#whenmars|archive-url=https://web.archive.org/web/20060209192146/http://www.space.com/news/bush_plan_faq_040115.html#whenmars|archive-date=2006-02-09|title=When do we get to Mars?|website=Space.com FAQ: Bush's New Space Vision|date=19 September 2005|access-date=2006-06-13}}</ref><ref name="mars_daily">{{cite news|url=http://www.marsdaily.com/reports/NASA_aims_to_put_man_on_Mars_by_2037_999.html|agency=AFP|title=NASA aims to put man on Mars by 2037|access-date=2012-08-12|archive-date=2012-03-12|archive-url=https://web.archive.org/web/20120312141624/http://www.marsdaily.com/reports/NASA_aims_to_put_man_on_Mars_by_2037_999.html|url-status=live}}</ref><ref name="marshome">{{cite web|url=http://www.marshome.org/|title=The Mars Homestead Project—Arrive, Survive, & Thrive!|publisher=Marshome.org|access-date=2009-09-20|archive-date=2012-03-01|archive-url=https://web.archive.org/web/20120301104324/http://marshome.org/|url-status=live}}</ref><ref name="aurora021011">{{cite web|date=October 11, 2002|url=http://www.esa.int/SPECIALS/Aurora/ESAONKTHN6D_0.html|title=Liftoff for Aurora: Europe's first steps to Mars, the Moon and beyond|access-date=2007-03-03|archive-date=2010-10-02|archive-url=https://web.archive.org/web/20101002175305/http://www.esa.int/SPECIALS/Aurora/ESAONKTHN6D_0.html|url-status=live}}</ref>

=={{anchor|Mars Curse}}Probe difficulties==
[[File:Ds2.jpg|thumb|left|Deep Space 2 technology]]
{| class=wikitable style="text-align:center; float:right; font-size:88%; margin-left:1em;"
|+ Mars Spacecraft 1988–1999
! Spacecraft !! Outcome
|-
| [[Phobos 1]] || {{Failure}}
|-
| [[Phobos 2]] || {{Partial success}}<!-- orbiter failed shortly before the last phase of the mission -->
|-
| [[Mars Observer]] || {{Failure}}
|-
| [[Mars 96]] || {{Failure}}
|-
| [[Mars Pathfinder]] || {{Success}}
|-
| [[Mars Global Surveyor]] || {{Success}}
|-
| [[Mars Climate Orbiter]] || {{Failure}}
|-
| [[Mars Polar Lander]] || {{Failure}}
|-
| [[Deep Space 2]] || {{Failure}}
|-
| [[Nozomi (spacecraft)|Nozomi]] || {{Failure}}
|}

The challenge, complexity and length of Mars missions have led to many mission failures.<ref name=universetoday>[http://www.universetoday.com/2008/03/22/the-mars-curse-why-have-so-many-missions-failed/ The "Mars Curse": Why Have So Many Missions Failed?] {{Webarchive|url=https://web.archive.org/web/20090504143915/http://www.universetoday.com/2008/03/22/the-mars-curse-why-have-so-many-missions-failed/ |date=2009-05-04 }}. Universetoday.com (2008-03-22). Retrieved on 2012-08-14.</ref> The high failure rate of [[#Timeline of Mars exploration|missions]] attempting to explore Mars is informally called the "Mars Curse" or "Martian Curse".<ref>{{cite news | last=Knight | first=Matthew | url=http://www.cnn.com/2006/TECH/science/12/23/mwonders.mars/index.html | title=Beating the curse of Mars | work=Science & Space | access-date=2007-03-27 | archive-date=2020-02-01 | archive-url=https://web.archive.org/web/20200201210652/http://www.cnn.com/2006/TECH/science/12/23/mwonders.mars/index.html | url-status=live }}</ref> The phrase "Galactic Ghoul"<ref name=OrangevilleCitizen-2008-10-23>{{cite news|url=http://www.citizen.on.ca/news/2008/1023/columns/032.html|title=Looking to Mars|last=Bothwell|first=William|date=2008-10-23|publisher=Orangeville Citizen|access-date=2020-12-23|url-status=dead|archive-url=https://web.archive.org/web/20110706192601/http://www.citizen.on.ca/news/2008-10-23/columns/032.html|archive-date=2011-07-06}}</ref> or "Great Galactic Ghoul" refers to a fictitious space monster that subsists on a diet of Mars [[uncrewed space mission|probe]]s, and is sometimes facetiously used to "explain" the recurring difficulties.<ref>[http://www.nap.edu/books/0309090504/html/41.html "The Depths of Space: The Story of the Pioneer Planetary Probes (2004)"] {{Webarchive|url=https://web.archive.org/web/20070313215518/http://www.nap.edu/books/0309090504/html/41.html |date=2007-03-13 }} from [http://www.nap.edu/ The National Academies Press] {{Webarchive|url=https://web.archive.org/web/20210320202045/https://www.nap.edu/ |date=2021-03-20 }}. URL accessed April 7, 2006.</ref><ref name=Time>[https://web.archive.org/web/20050325034316/http://www.time.com/time/archive/preview/0,10987,986681,00.html "Uncovering the Secrets of Mars"] (first paragraph only). ''[[Time (magazine)|Time]]'' July 14, 1997 Vol. 150 No. 2. URL accessed April 7, 2006.</ref><ref>Matthews, John & Caitlin. "The Element Encyclopedia of Magical Creatures", Barnes & Noble Publishing, 2005. {{ISBN|0-7607-7885-X}}.</ref><ref>{{cite web | last=Dinerman | first=Taylor | url=http://www.thespacereview.com/article/232/1 | title=Is the Great Galactic Ghoul losing his appetite? | website=The space review | date=2004-09-27 | access-date=2007-03-27 | archive-date=2019-08-07 | archive-url=https://web.archive.org/web/20190807010128/http://www.thespacereview.com/article/232/1 | url-status=live }}</ref>

Two Soviet probes were sent to Mars in 1988 as part of the [[Phobos program]]. [[Phobos 1]] operated normally until an expected communications session on 2 September 1988 failed to occur. The problem was traced to a software error, which deactivated Phobos 1's attitude thrusters, causing the spacecraft's solar arrays to no longer point at the Sun, depleting Phobos 1's batteries. ''[[Phobos 2]]'' operated normally throughout its cruise and Mars orbital insertion phases on January 29, 1989, gathering data on the Sun, interplanetary medium, Mars, and Phobos. Shortly before the final phase of the mission – during which the spacecraft was to approach within 50 m of Phobos' surface and release two landers, one a mobile 'hopper', the other a stationary platform – contact with ''Phobos 2'' was lost. The mission ended when the spacecraft signal failed to be successfully reacquired on March 27, 1989. The cause of the failure was determined to be a malfunction of the on-board computer.{{citation needed|date=August 2012}}

Just a few years later in 1992, ''[[Mars Observer]]'', launched by NASA, failed as it approached Mars. [[Mars 96]], an orbiter launched on November 16, 1996, by Russia failed, when the planned second burn of the Block D-2 fourth stage did not occur.<ref>{{cite web |author=Lissov |first=Igor |date=1996-09-19 |others=with comments from Jim Oberg |title=What Really Happened With Mars-96? |url=http://www.fas.org/spp/eprint/mars96lo.htm |url-status=live |archive-url=https://web.archive.org/web/20101111122314/http://www.fas.org/spp/eprint/mars96lo.htm |archive-date=2010-11-11 |access-date=2012-08-20 |publisher=Federation of American Scientists}}</ref>

Following the success of Global Surveyor and Pathfinder, another spate of failures occurred in 1998 and 1999, with the Japanese [[Nozomi (probe)|Nozomi]] orbiter and NASA's [[Mars Climate Orbiter]], ''[[Mars Polar Lander]]'', and [[Deep Space 2]] penetrators all suffering various fatal errors. The Mars Climate Orbiter was noted for mixing up [[U.S. customary units]] with [[metric system|metric units]], causing the orbiter to burn up while entering Mars' atmosphere.<ref>{{cite web|url=http://www.cnn.com/TECH/space/9909/30/mars.metric.02/index.html|title=CNN – Metric mishap caused loss of NASA orbiter – September 30, 1999|website=cnn.com|access-date=9 February 2017|archive-date=24 October 2019|archive-url=https://web.archive.org/web/20191024152139/http://www.cnn.com/TECH/space/9909/30/mars.metric.02/index.html|url-status=live}}</ref>

The [[European Space Agency]] has also attempted to land two probes on the Martian surface; ''[[Beagle 2]]'', a British-built lander that failed to deploy its solar arrays properly after touchdown in December 2003, and [[Schiaparelli EDM lander|''Schiaparelli'']], which was flown along the [[ExoMars Trace Gas Orbiter]]. Contact with the ''Schiaparelli'' EDM lander was lost 50 seconds before touchdown.<ref>{{Cite news|url=https://www.bbc.co.uk/news/science-environment-37715202|title=Schiaparelli Mars probe's parachute 'jettisoned too early'|last=Amos|first=Jonathan|date=2016-10-20|newspaper=BBC News|language=en-GB|access-date=2016-10-20|archive-date=2016-10-20|archive-url=https://web.archive.org/web/20161020103116/http://www.bbc.co.uk/news/science-environment-37715202|url-status=live}}</ref> It was later confirmed that the lander struck the surface at a high velocity, possibly exploding.<ref name="edmlandingcrash">{{cite web |url=http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21132 |title=Space Images {{pipe}} Schiaparelli Impact Site on Mars, in Color |website=Jpl.nasa.gov |date=2016-10-19 |access-date=2016-11-04 |archive-date=2016-11-04 |archive-url=https://web.archive.org/web/20161104150400/http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21132 |url-status=live }}</ref>
{{-}}

==See also==
{{Portal|Solar System|Spaceflight}}
;Mars
{{div col|colwidth=30em}}
* [[Colonization of Mars]] 
* [[Human mission to Mars]] 
* [[Life on Mars]]
* [[List of artificial objects on Mars]]
* [[List of missions to Mars]]
* [[Mars landing]] 
* [[Mars race]]
* [[Mars rover]] 
* [[Mars Scout Program]]
* [[Mars Society]]
{{div col end}}
;General
{{div col|colwidth=30em}}
* [[Observations and explorations of Venus]]
* [[Space colonization]]
* [[Space exploration]]
* [[Space weather]]
* [[Timeline of Solar System exploration]]
*[[Crew Health and Performance Exploration Analog]]
{{div col end}}

==Notes==
:{{note|active|α}} The diagram includes missions that are active on the surface, such as operational rovers and landers, as well as probes in Mars orbit. The diagram does not include missions that are en route to Mars, or probes that performed a fly-by of Mars and moved on.

==References==
{{Reflist|30em}}

==Bibliography==
* ''Mars – A Warmer, Wetter Planet'' by Jeffrey S. Kargel (published July 2004; {{ISBN|978-1-85233-568-7}})
* ''The Compact NASA Atlas of the Solar System'' by Ronald Greeley and Raymond Batson (published January 2002; {{ISBN|0-521-80633-X}})
* ''Mars: The NASA Mission Reports'' / edited by Robert Godwin (2000) {{ISBN|1-896522-62-9}}

==External links==
{{Commons category|Mars exploration}}
*[http://mars.nasa.gov/ NASA Mars exploration website]
*[http://www.scientificamerican.com/report/mars-exploration/ Mars Exploration] [[Scientific American]] Maps and Articles
*[http://www.spacedaily.com/news/mars-future-05f.html Next on Mars] (Bruce Moomaw, Space Daily, 9 March 2005): An extensive overview of NASA's Mars exploration plans
*[http://www.mentallandscape.com/C_CatalogMars.htm Catalog of Soviet Mars images] Collection of Russian Mars probes' images
*[http://www.phy6.org/stargaze/Smars1.htm Simplified study of orbits to land on Mars and return to Earth] (High School level)
*[http://www.planetary.org/explore/space-topics/mars/ Planetary Society Mars page]

{{Space exploration}}
{{Mars}}
{{Geography of Mars}}
{{Mars spacecraft}}
{{Human missions to Mars}}
{{Viking program}}
{{Mars Pathfinder}}
{{NASAMER}}
{{MSL}}
{{Mars 2020}}
{{Planetary exploration}}
{{Solar System}}
{{Authority control}}

{{DEFAULTSORT:Exploration Of Mars}}
[[Category:Exploration of Mars| ]]
[[Category:Discovery and exploration of the Solar System]]
[[Category:Articles containing video clips]]
[[Category:Spaceflight]]
[[Category:Mars]]