Let's face it, sometime within the next century or so, overpopulation, the exhaustion of natural resources, an alien invasion -- or perhaps the optimistic spirit of adventure -- will force us to leave Earth in search of a new habitat. Earlier this week, NASA and DARPA announced a preliminary "Hundred-Year Starship" program for sending pioneers on permanent missions to Mars. To many, relocation from Earth sounds like a glorified exile, but some retro-futuristic eye candy from the Popular Science archives will surely change their minds.
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