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danielravennest t1_ix3c4wj wrote

Reply to comment by StrangeTangerine1525 in Mars was once covered by 300-meter deep oceans, study shows by magenta_placenta

Countering air loss, both Earth and Mars have a flux of meteor/asteroid material coming in. Mars likely gets relatively more because its orbit skims the inner edge of the Asteroid Belt. Some of the incoming objects contain volatiles.

So a full accounting of mass flow needs to consider both loss and gain processes.

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StrangeTangerine1525 t1_ix57p54 wrote

True, but because of Mar's lower gravity its less likely to keep any of those volatiles, and any that do stay are likely to freeze in to the polar caps and crust. Anyway you slice it making Mars ... less Mars is going to be quite hard.

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