Didn't mars' magnetic field quit, thus allowing the sun to pummel the surface with radiation? I thought that was the reason the atmosphere was no longer there.
I think mars is a bit out of the habitable zone also. At night it would be far too cold for an exposed human to stand. Not sure how much of a difference an atmosphere would have on this. Perhaps warm it up a bit, but I don't think it would be enough to go walking around with a jacket and toque on.
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