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Originally Posted by worth
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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By the time we would have the technology to even attempt terraforming, we would be able to either ensure that the greenhouse effect was sufficient to make the planet habitable... or be able to create enclosed settlements not directly exposed to the atmosphere of the planet itself.