Sierra-117- t1_iu19cto wrote
Reply to comment by kozy138 in A recently released set of topography maps provides new evidence for an ancient northern ocean on Mars. The maps offer the strongest case yet that the planet once experienced sea-level rise consistent with an extended warm and wet climate, not the harsh, frozen landscape that exists today. by Wagamaga
Very good question!
It was able to maintain liquid water through a thicker atmosphere than it currently has. Basically, a greenhouse effect. It would still be freezing at night though.
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