Mars’s ancient atmosphere might be locked in clay

While water was present on Mars, they suggest, the liquid could have trickled through certain rock types and set off a slow chain of reactions that progressively drew carbon dioxide out of the atmosphere and converted it into methane, a form of carbon that could be stored in the clay for eons. 

COURTESY OF THE RESEARCHERS

The researchers applied their knowledge of interactions between rocks and gases on Earth to how similar processes could play out on Mars. They found that the quantity of clay covering the Martian surface could hold up to 1.7 bar of CO₂, which would be equivalent to around 80% of the planet’s early atmosphere. “In some ways, Mars’s missing atmosphere could be hiding in plain sight,” Murray says.

The researchers think it’s possible that this sequestered carbon could one day be recovered and converted into propellant to fuel future missions between Mars and Earth. 

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