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Generation Ship stories are set aboard that type of spacecraft. Often those ships are so large, and the voyage so long, that (most or all of) its inhabitants consider other worlds to be the stuff of legend. The subgenre was pioneered by J. D. Bernal, with his 1929 novel The World, The Flesh, & The Devil. A popular example is Robert A. Heinlein's novel Orphans of the Sky. Another is the original Star Trek episode "For the World is Hollow and I Have Touched the Sky."
