Scientific assessments on the microbial habitability of Mars
For other uses, see Life on Mars (disambiguation).
"Exobiology on Mars" redirects here. For the space mission, see ExoMars.
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Life in the universe
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Planetary habitability in the Solar System
Venus
Earth
Mars
Europa
Enceladus
Titan
Life outside the Solar System
Potentially habitable exoplanets
Galactic habitable zone
Habitability of...
Binary star systems
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The possibility of life on Mars is a subject of interest in astrobiology due to the planet's proximity and similarities to Earth. To date, no proof of past or present life has been found on Mars. Cumulative evidence suggests that during the ancient Noachian time period, the surface environment of Mars had liquid water and may have been habitable for microorganisms, but habitable conditions do not necessarily indicate life.[1][2]
Scientific searches for evidence of life began in the 19th century and continue today via telescopic investigations and deployed probes, searching for water, chemical biosignatures in the soil and rocks at the planet's surface, and biomarker gases in the atmosphere.[3]
Mars is of particular interest for the study of the origins of life because of its similarity to the early Earth. This is especially true since Mars has a cold climate and lacks plate tectonics or continental drift, so it has remained almost unchanged since the end of the Hesperian period. At least two-thirds of Mars' surface is more than 3.5 billion years old, and it could have been habitable 4.48 billion years ago, 500 million years before the earliest known Earth lifeforms;[4] Mars may thus hold the best record of the prebiotic conditions leading to life, even if life does not or has never existed there.[5][6]
Following the confirmation of the past existence of surface liquid water, the Curiosity, Perseverance and Opportunity rovers started searching for evidence of past life, including a past biosphere based on autotrophic, chemotrophic, or chemolithoautotrophic microorganisms, as well as ancient water, including fluvio-lacustrine environments (plains related to ancient rivers or lakes) that may have been habitable.[7][8][9][10] The search for evidence of habitability, taphonomy (related to fossils), and organic compounds on Mars is now a primary objective for space agencies.
The findings of organic compounds inside sedimentary rocks and of boron on Mars are of interest as they are precursors for prebiotic chemistry. Such findings, along with previous discoveries that liquid water was clearly present on ancient Mars, further supports the possible early habitability of Gale Crater on Mars.[11][12] Currently, the surface of Mars is bathed with ionizing radiation, and Martian soil is rich in perchlorates toxic to microorganisms.[13][14] Therefore, the consensus is that if life exists—or existed—on Mars, it could be found or is best preserved in the subsurface, away from present-day harsh surface processes.
In June 2018, NASA announced the detection of seasonal variation of methane levels on Mars. Methane could be produced by microorganisms or by geological means.[15] The European ExoMars Trace Gas Orbiter started mapping the atmospheric methane in April 2018, and the 2022 ExoMars rover Rosalind Franklin was planned to drill and analyze subsurface samples before the programme's indefinite suspension, while the NASA Mars 2020 rover Perseverance, having landed successfully, will cache dozens of drill samples for their potential transport to Earth laboratories in the late 2020s or 2030s. As of February 8, 2021, an updated status of studies considering the possible detection of lifeforms on Venus (via phosphine) and Mars (via methane) was reported.[16]
^Ferreira, Becky (July 24, 2020). "3 Great Mysteries About Life on Mars - How habitable was early Mars? Why did it become less hospitable? And could there be life there now?". The New York Times. Retrieved July 24, 2020.
^Chang, Kenneth (September 12, 2016). "Visions of Life on Mars in Earth's Depths". Financial Times. Archived from the original on September 12, 2016. Retrieved September 12, 2016.
^Mumma, Michael J. (January 8, 2012). The Search for Life on Mars. Origin of Life Gordon Research Conference. Galveston, TX. Archived from the original on June 4, 2016.
^Moser, D. E.; Arcuri, G. A.; Reinhard, D. A.; White, L. F.; Darling, J. R.; Barker, I. R.; Larson, D. J.; Irving, A. J.; McCubbin, F. M.; Tait, K. T.; Roszjar, J.; Wittmann, A.; Davis, C. (2019). "Decline of giant impacts on Mars by 4.48 billion years ago and an early opportunity for habitability". Nature Geoscience. 12 (7): 522–527. Bibcode:2019NatGe..12..522M. doi:10.1038/s41561-019-0380-0.
^McKay, Christopher P.; Stoker, Carol R. (1989). "The early environment and its evolution on Mars: Implication for life". Reviews of Geophysics (Submitted manuscript). 27 (2): 189–214. Bibcode:1989RvGeo..27..189M. doi:10.1029/RG027i002p00189.
^Gaidos, Eric; Selsis, Franck (2007). "From Protoplanets to Protolife: The Emergence and Maintenance of Life". Protostars and Planets V: 929–44. arXiv:astro-ph/0602008. Bibcode:2007prpl.conf..929G.
^Grotzinger, John P. (January 24, 2014). "Introduction to Special Issue - Habitability, Taphonomy, and the Search for Organic Carbon on Mars". Science. 343 (6169): 386–387. Bibcode:2014Sci...343..386G. doi:10.1126/science.1249944. PMID 24458635.
^Various (January 24, 2014). "Special Issue - Table of Contents - Exploring Martian Habitability". Science. 343 (6169): 345–452. Archived from the original on January 29, 2014.
^Various (January 24, 2014). "Special Collection - Curiosity - Exploring Martian Habitability". Science. Archived from the original on January 28, 2014.
^Grotzinger, J. P.; Sumner, D. Y.; Kah, L. C.; Stack, K.; Gupta, S.; Edgar, L.; Rubin, D.; Lewis, K.; Schieber, J.; et al. (January 24, 2014). "A Habitable Fluvio-Lacustrine Environment at Yellowknife Bay, Gale Crater, Mars". Science. 343 (6169): 1242777. Bibcode:2014Sci...343A.386G. CiteSeerX 10.1.1.455.3973. doi:10.1126/science.1242777. PMID 24324272. S2CID 52836398.
^Gasda, Patrick J.; et al. (September 5, 2017). "In situ detection of boron by ChemCam on Mars" (PDF). Geophysical Research Letters. 44 (17): 8739–8748. Bibcode:2017GeoRL..44.8739G. doi:10.1002/2017GL074480.
^Paoletta, Rae (September 6, 2017). "Curiosity Has Discovered Something That Raises More Questions About Life on Mars". Gizmodo. Archived from the original on September 6, 2017. Retrieved September 6, 2017.
^Daley, Jason (July 6, 2017). "Mars Surface May Be Too Toxic for Microbial Life - The combination of UV radiation and perchlorates common on Mars could be deadly for bacteria". Smithsonian. Archived from the original on July 9, 2017. Retrieved July 8, 2017.
^Wadsworth, Jennifer; Cockell, Charles S. (July 6, 2017). "Perchlorates on Mars enhance the bacteriocidal effects of UV light". Scientific Reports. 7 (4662): 4662. Bibcode:2017NatSR...7.4662W. doi:10.1038/s41598-017-04910-3. PMC 5500590. PMID 28684729.
^Brown, Dwayne; Wendel, JoAnna; Steigerwald, Bill; Jones, Nancy; Good, Andrew (June 7, 2018). "Release 18-050 - NASA Finds Ancient Organic Material, Mysterious Methane on Mars". NASA. Archived from the original on June 7, 2018. Retrieved June 7, 2018.
^Chang, Kenneth; Stirone, Shannon (February 8, 2021). "Life on Venus? The Picture Gets Cloudier - Despite doubts from many scientists, a team of researchers who said they had detected an unusual gas in the planet's atmosphere were still confident of their findings". The New York Times. Retrieved February 8, 2021.
The possibility of lifeonMars is a subject of interest in astrobiology due to the planet's proximity and similarities to Earth. To date, no proof of...
have appeared in BBC One's science fiction/police procedural drama, LifeonMars. Ted Bannister (John Henshaw) appeared in episode three as a trade union...
Water ice onMars likeliest areas (December 10, 2019) Mars – Utopia Planitia Almost all water onMars today exists as ice, though it also exists in small...
Mars is the fourth planet from the Sun. The surface of Mars is orange-red because it is covered in iron(III) oxide dust, giving it the nickname "the Red...
name of the album to be LifeOnMars (Working title was; 'The Awakening' and they played with various titles like Death OnMars and Skeleton), and that...
terraforming the planet. Currently, only robotic landers and rovers have been onMars. The farthest humans have been beyond Earth is the Moon, under the NASA's...
The Mars Science Laboratory and its rover, Curiosity, were launched from Earth on 26 November 2011. As of April 26, 2024, Curiosity has been on the planet...
has made use of orbital spacecraft, landers, and Mars rovers to explore the possibilities of lifeonMars, as well as the planet's climate and natural resources...
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Sol (borrowed from the Latin word for sun) is a solar day onMars; that is, a Mars-day. A sol is the apparent interval between two successive returns of...
Colonization or settlement of Mars is the theoretical migration of humans to Mars and the establishment of long-term human presence on the planet. The prospect...
history, and assessing its past habitability, the possibility of past lifeonMars, and the potential for preservation of biosignatures within accessible...
Present LifeonMars". Space.com. "NASA denies Marslife reports". spacetoday.net. 19 February 2005. Chow, Dennis (22 July 2011). "NASA's Next Mars Rover...
Martians, was published in 1897 and went on to have a major influence on the science fiction genre. LifeonMars appeared frequently in fiction throughout...
together in a base camp in Coober Pedy, Australia, designed to simulate lifeonMars. Each cycle, the group elects one celebrity as "Base Commander" who becomes...
the original on 10 May 2012. Retrieved 25 May 2012. Vastag, Brian (21 August 2011). "Oldest 'microfossils' raise hopes for lifeonMars". The Washington...
The atmosphere of Mars is the layer of gases surrounding Mars. It is primarily composed of carbon dioxide (95%), molecular nitrogen (2.85%), and argon...
considerable relevance to the question of whether life is or ever has been present on the planet. Mars has been studied by Earth-based instruments since...
project or concurrent projects aspiring to transform Mars from a planet hostile to terrestrial life to one that could sustainably host humans and other...