Quote:
Originally Posted by moklianne
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Mars and Venus could have been Earths of the distant past.
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^^^ pretty much. Who says humans were the first to roam the solar system??? We have plenty time in which for this to happen from either planet.
Though I think unless something else happened to boil off or drastically decrease earths atmosphere. I don't think we'd reach mars levels of aridity. We might be able to get a runaway greenhouse affect that boils the oceans into the atmosphere though and get very Venus like.
Even a weak magnetic field wouldn't kill the earth completely. IMO. Hard to say.