This artist’s impression shows how Mars may have looked about four billion years ago, when it would have been more conducive to life. (credit: ESO)
In the year 2016 one might be forgiven for thinking the world is going to hell. Across much of Europe and the United States a distressed and angry working class has begun wielding nationalism as a blunt weapon against the disconnected ruling class. Islamic radicals have stepped up attacks against the West as well as moderate practitioners of their own faith. Then there is humanity’s untrammeled use of fossil fuels, worsening water shortages, and other environmental degradations of the planet—not to mention the proliferating threat of nuclear, biological, and chemical weapons. Finally, we also haven’t yet gotten around to tracking every asteroid that might wipe out humankind.
In short, Earth might need a backup plan.
Elon Musk certainly thinks so, having staked much of his fortune on SpaceX and its relentlessly pursued goal of colonizing Mars. But Mars is not the only place humans could go. There are other worlds in the Solar System where humans could walk without space suits, find ample energy, or even swim in subsurface oceans. None of these places are remotely as habitable as Earth, even at our planet’s cold poles. But they also don’t have Earth’s political baggage, either. So here’s our guide to the five-best options for DIY colonists:
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