Submitted by Pluto_and_Charon t3_y8e3al in space
Pluto_and_Charon OP t1_it2wty0 wrote
Reply to comment by arminVT in Curiosity Mars Rover Reaches Long-Awaited Salty Region by Pluto_and_Charon
Excellent question! This is one of the biggest debates in Mars science - we really don't know to be honest! All we know is that the atmosphere must have been far thicker than today and must have contained a lot of greenhouse gases to explain how a planet much further than the sun was able to sustain liquid water on its surface without it freezing.
Candidates include: CO2 NH3 CH4 SO2 H2O
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