In the past few weeks, two U.S. billionaires have presented their latest visions of extending human civilization into the Solar System. It is an old idea, but on the surface Jeff Bezos and Elon Musk appear to have the ambition, funds and sheer chutzpah to at least get the ball rolling. Both have space vehicles flying, skilled engineering staffs and businesses unrelated to spaceflight that can subsidize their lofty enthusiasms. But the ways they are tackling the problem could not be more ...

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