BaffleBlend t1_jaex1le wrote
Reply to comment by breckenridgeback in eli5: when the sun swallows mercury in 4 billion years, how is that going to affect earth? by grass-whore
On the plus side, assuming (admittedly rather boldly) that there's any life left in the universe by then, Mars will be in the temperature range that Earth once was.
breckenridgeback t1_jaexs5x wrote
...but it still won't have a magnetic field, so it won't be able to hold on to a thick atmosphere regardless.
Mars already isn't that cold. On a warm day near Mars' equator, you could walk around in a sweater quite comfortably provided you had pressurized oxygen to breathe.
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