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Science fiction (abbreviated '''SF''' or '''sci-fi''' with varying punctuation and case) is a broad genre of Fiction that often involves speculations based on current or future Science or Technology . Science fiction is found in books, art, television, movies, games, theater, and other media.

Science fiction differs from fantasy in that, within the context of the story, its imaginary elements are largely possible within established or postulated laws of nature (though ''some'' elements in a story might still be pure imaginative speculation).

Science fiction often involves one or more of the following elements:
  • A setting in the future or in an alternative time line.

  • A setting in Outer Space or involving Aliens or unknown civilizations.

  • The discovery or application of new scientific principles, such as Time Travel or Psionics , or new technology, such as Nanotechnology , Faster-than-light travel or Robot s.

  • Political or social systems different from those of the known present or past.


Exploring the consequences of such differences is the traditional purpose of science fiction, making it a "literature of ideas".