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Mars is solid ground that is (relatively) easy to get to without too bad of a gravity well to get back into space from. Mars has water, gypsum, carbon, phosphorus. Mars has just enough air to block a good portion of the bad cosmic radiation without needing 3 foot thick stone shelters. Mars is really the only place out there that we know of that offers the hope of Humanity being a multi-planet species. Mars is not all that great, really, but it is the best we have.