Mars’s ancient atmosphere, once rich in carbon dioxide, might be trapped within the planet’s clay-covered crust. Geologists from MIT, Oliver Jagoutz and Joshua Murray, suggest that water on Mars could have initiated reactions converting atmospheric CO2 into methane, which then got stored in clay. Their research indicates that the Martian surface’s clay could hold up to 1.7 bar of CO2, representing about 80% of the planet’s early atmosphere. This finding implies that Mars’s missing atmosphere might be hiding in plain sight. The researchers also speculate that this sequestered carbon could potentially be recovered and used as propellant for future Mars-Earth missions.
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