AMars rover is a remote-controlledmotor vehicle designed to travel on the surface ofMars.Rovers have several advantages over stationarylanders: they examine more territory, they can be directed to interesting features, they can place themselves in sunny positions to weather winter months, and they can advance the knowledge of how to perform very remoterobotic vehicle control. They serve a different purpose than orbital spacecraft likeMars Reconnaissance Orbiter. A more recent development is theMars helicopter.
As of May 2021[update], there have been six successful robotically operated Mars rovers; the first five, managed by the AmericanNASA Jet Propulsion Laboratory, were (by date of Mars landing):Sojourner (1997),Spirit (2004–2010),Opportunity (2004–2018),Curiosity (2012–present), andPerseverance (2021–present). The sixth, managed by theChina National Space Administration, isZhurong (2021–2022).
On January 24, 2016,NASA reported that thencurrent studies on Mars byOpportunity andCuriosity would be searching for evidence of ancient life, including abiosphere based onautotrophic,chemotrophic orchemolithoautotrophicmicroorganisms, as well as ancient water, includingfluvio-lacustrine environments (plains related to ancientrivers orlakes) that may have beenhabitable.[1][2][3][4][5] The search for evidence ofhabitability,taphonomy (related tofossils), andorganic carbon on Mars is now a primary NASA objective.[1][6]
The Soviet probes,Mars 2 andMars 3, were physically tethered probes;Sojourner was dependent on theMars Pathfinder base station for communication with Earth;Opportunity,Spirit andCuriosity were on their own. As of November 2023,Curiosity is still active, whileSpirit,Opportunity, andSojourner completed their missions before losing contact. On February 18, 2021,Perseverance, the newest American Mars rover, successfully landed. On May 14, 2021, China'sZhurong became the first non-American rover to successfully operate on Mars.
Multiple rovers have been dispatched to Mars:
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Curiosity of theMars Science Laboratory (MSL) mission by NASA, was launched November 26, 2011[7][8] and landed at theAeolis Palus plain nearAeolis Mons (informally "Mount Sharp")[9][10][11][12] inGale Crater on August 6, 2012.[13][14][15] TheCuriosity rover is still operational as of 2025.Perseverance is NASA's rover based on the successfulCuriosity design. Launched with theMars 2020 mission on July 30, 2020, it landed on February 18, 2021.[16] It carried theMars helicopterIngenuity attached to its belly. AlthoughIngenuity's mission has ended,Perseverance remains operational as of March 2024.
Sojourner rover,Mars Pathfinder, landed successfully on July 4, 1997. Communications were lost on September 27, 1997.Sojourner had traveled a distance of just over 100 meters (330 ft).[17]Spirit (MER-A),Mars Exploration Rover (MER), launched on June 10, 2003,[18] and landed on January 4, 2004. Nearly six years after the original mission limit,Spirit had covered a total distance of 7.73 km (4.80 mi) but its wheels became trapped in sand.[19] The last communication received from the rover was on March 22, 2010, and NASA ceased attempts to re-establish communication on May 25, 2011.[20]Opportunity (MER-B), Mars Exploration Rover, launched on July 7, 2003[18] and landed on January 25, 2004.Opportunity surpassed the previous records for longevity at 5,352sols (5498 Earth days from landing to mission end; 15 Earth years or 8 Martian years) and covered 45.16 km (28.06 mi). The rover sent its last status on 10 June 2018 when a global2018 Mars dust storm blocked the sunlight needed to recharge its batteries.[21] After hundreds of attempts to reactivate the rover, NASA declared the mission complete on February 13, 2019.
Zhurong launched with theTianwen-1CNSA Mars mission on July 23, 2020, landed on May 14, 2021, in the southern region ofUtopia Planitia, and deployed on May 22, 2021, while dropping a remote selfie camera on 1 June 2021.[22][23] Designed for a lifespan of 90 sols (93 Earth days),[24]Zhurong had been active for 347 sols (356.5 days) since its deployment and traveled on Mars's surface for 1,921 m (6,302 ft).[25] Since 20 May 2022, the rover was deactivated due to approaching sandstorms and Martian winter.[26][27] But the larger-than-expected build-up of dust covering its solar panels prevented it from self-reactivation. On 25 April 2023, the mission designer Zhang Rongqiao announced that the buildup of dust from the last inactivation is greater than planned, indicating the rover could be inactive "forever".[28]
Mars 2,PrOP-M rover, 1971,Mars 2 landing failed, destroying Prop-M with it. TheMars 2 and3 spacecraft from the Soviet Union had identical 4.5 kilograms (9.9 lb)Prop-M rovers. They were to move onskis while connected to the landers with cables.[29]Mars 3,PrOP-M rover, landed successfully on December 2, 1971. 4.5 kilograms (9.9 lb) rover tethered to the Mars 3 lander. Lost when theMars 3 lander stopped communicating about 110 seconds after landing.[29] The loss of communication may have been due to the extremely powerful Martian dust storm taking place at the time, or an issue with the Mars 3 orbiter's ability to relay communications.
ESA'sExoMars roverRosalind Franklin was confirmed technically ready for launch in March 2022 and planned to launch in September 2022, but due to the suspension of cooperation with Roscosmos this is delayed until at least 2028. A fast-track study was started to determine alternative launch options.[30]
The RussianMoscow Aviation Institute and the IndianIIT are jointly developing a fixed-wing MarsUAV which as of March 2023[update] is scheduled for launch in late 2025.[31]
TheJAXAMelos rover was supposed to be launched in 2022. JAXA has not given an update since 2015.NASAMars Geyser HopperISRO has proposed a Mars rover as part ofMars Lander Mission, its second Mars mission in 2030.[32] |
Examples of instruments onboard landed rovers include:
Clickable image:Clicking on the labels will open a new article.
Circa the 2010s, NASA had established certain goals for the rover program.
NASA distinguishes between "mission" objectives and "science" objectives. Mission objectives are related to progress inspace technology and development processes. Science objectives are met by the instruments during their mission in space.
The science instruments are chosen and designed based on the science objectives and goals. The primary goal of theSpirit andOpportunity rovers was to investigate "the history of water on Mars".[42]
The four science goals of NASA's long-termMars Exploration Program are:
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