Submitted by magenta_placenta t3_yymoqt in space
asmara1991man t1_iww9g4p wrote
Reply to comment by RhymesWith_DoorHinge in Mars was once covered by 300-meter deep oceans, study shows by magenta_placenta
So does that mean if there was water there humans could have breathed normally there?
InvestorsaurusRex t1_iwwckvo wrote
Yea since we breathe ocean water..
AlterEgo3561 t1_iwwfggj wrote
You don't know everyone's life. I for one identify as a lake trout.
themonkeymoo t1_iwx7qqg wrote
OK, so *some* of us breathe lake water instead
...jeeze
LurkerInSpace t1_iwwynta wrote
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.
[deleted] t1_iwwu1hd wrote
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