A space colony is an orbiting artificial city built in outer space, usually at one of the Lagrangian points, to allow human habitation outside the Earth's atmosphere. Essentially gigantic hollow space stations, the interior surface of each space colony are constructed to simulate the Earth's terrains, and the colony provides centrifugal gravity via rotating to allow a more "normal" life for its residents. For a list of known colonies and asteroids in the Universal Century see Universal...