The idea that characters can fly from planet to planet, or star to star, defying current science and technology, is central to science fiction. Although some of these ideas predated the space age, after the 1950s, fictional depictions of space travel needed to suggest conceivable ways to cross interstellar distances to seem plausible. Some authors suggested faster-than-light drives, hyper drives, jump drives, worm holes, and black holes.
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