Interior view of cylinder colony looking out through large windows. In the 1970s, three space colony summer studies were conducted at NASA Ames Research Center. Artistic concepts were designed and rendered for colonies housing about 10,000 people. Space colonization is permanent human habitation off the planet Earth. No space colonies have been built so far. The building of a space colony would present a set of huge technological and economic challenges.
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Album / Science Source / NASA Ames Research Center/Rick Guidice