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27 December, 06:07

What makes us think that mars must once have had an atmosphere that was warmer and had higher surface pressure?

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  1. 27 December, 08:01
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    There must once have been a lot of outgassing, and hence a thicker atmosphere. b. The atmosphere is too cold and thin for liquid water today, yet we see evidence that water flowed on the surface in the past.
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