In the 1970s, NASA conducted a number of summer studies to create artwork depicting the future of space colonies. At 10,000 people, these colonies housed slightly more people than the current three-person ISS crew.

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That said, progress is being made. What, with six crew members scheduled for ISS duty in the near future, Earth will have literally doubled the population in orbit. Like I said, progress. Just 9,994 more to go. NASA NAS via MAKE]