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Science fiction  (sometimes called  sci-fi  or just  SF ) is a  genre  of  speculative fiction  that typically deals with  imaginative  and  futuristic  concepts such as advanced  science  and  technology ,  space exploration ,  time travel ,  parallel universes , and  extraterrestrial life . It has been called the " literature  of  ideas ", and often explores the potential consequences of  scientific, social, and technological innovations . [1] [2] Science fiction, whose roots go back to  ancient times , is related to  fantasy ,  horror , and  superhero  fiction, and contains many  subgenres . However its  exact definition  has long been disputed among  authors ,  critics , and  scholars . Science fiction  literature , film, television, and other media have become popular and influential over much of the world. Besides providing  entertainment , it can also criticize present-day  society , and is often said to inspire a " sense of wonder ". [3]