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The idea of furnishing giant habitats for humans to live in space has been around for decades. Some say we are closer than ever to making it a reality.
Space habitat - Wikipedia
This is what the space colonies of the near future might look like
Could a space station sustain a population of 5 million? - Quora
Private Space Habitat to Launch in 2020 Under Commercial
mars Discover Magazine
NASA selects 16 futuristic space technology concepts
mars Discover Magazine
Staying grounded in space requires artificial gravity
NASA's next space station will be 1,000 times farther from Earth