There have been several proposals for manned missions to Mars
. Some proposals include a colony; most don't. It's obvious that animals have evolved to live on Earth and not
in space, and it will take quite a bit of adjustment to get comfortable in a space colony of any kind -- whether it exists on the moon or Mars or just floats around somewhere in between. In any case, if we're serious about visiting other planets, we'll need to figure out how to survive the journey (and pay for it). Here are just a few links on the topic of colonizing space, even though no one has a complete plan for how to do so.
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