Science fiction (sometimes abbreviated to SF or science fiction) is a genre of speculative fiction, which typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes and extraterrestrial life. It is related to fantasy, horror and superhero fiction and contains many subgenres. Its exact definition has long been controversial among authors, critics, scholars and readers.

Science fiction, in literature, film, television, and other media, has become popular and influential throughout much of the world. It has been called the “literature of ideas”

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