Submitted by magenta_placenta t3_yymoqt in space
LurkerInSpace t1_iwwynta wrote
Reply to comment by asmara1991man in Mars was once covered by 300-meter deep oceans, study shows by magenta_placenta
It would need to have ~100 millibar partial pressure of oxygen to be breathable - with at least an extra 20 millibars of inert gases (or more oxygen).
Without biology oxygen doesn't stick around, so as with the early Earth the atmosphere was probably a mix of carbon dioxide and methane.
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