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Q&A How much technology for a ring-world to work?

There is this setup that I've seen a few times of a ring-shaped world where people live on the inner side. My question is: what is the minimum advancement of technology for such a thing to happen? ...

7 answers  ·  posted 10y ago by Sheraff‭  ·  last activity 10y ago by Sheraff‭

Question space planets