Microbial life may have resided within the first four kilometers of Mars’s porous crust.
that particularly benefited from the atmospheric composition of the time. Feeding on the CO2 and H2 that abounded in the atmosphere , they harnessedIn return, they released into the atmosphere large amounts of CH4 , a potent greenhouse gas that accumulated and heated up the climate. Since our sun at the time was not as bright as it is today, it may not have been able to maintain temperate conditions on the planet’s surface without the intervention of other aspects.
of Mars’s porous crust – namely, temperature, chemical composition, and the presence of liquid water. These were partly determined by surface conditions and partly by the planet’s internal characteristics . Where the given conditions were deemed habitable, the third model evaluated how these microorganisms would have survived under Mars’s surface and – alongside the crust and surface models – how this subterranean microbial biosphere would have influenced crust chemical composition, as well as atmosphere and climate.
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