Assumption Quote by Jack Williamson

[Science fiction is] that class of prose narrative treating of a situation that could not arise in the world we know, but which is…

— Kingsley Amis

Science-fiction ... can be defined as: Imaginative extrapolation of true natural phenomena, existing now, or likely to exist in the future.

— Hugo Gernsback

Science fiction is the search for a definition of mankind and his status in the universe which will stand in our advanced but confused…

— Brian Aldiss

Science fiction is fantasy about issues of science. Science fiction is a subset of fantasy. Fantasy predated it by several millennia. The '30s to…

— Raymond E. Feist

“I define science fiction as the art of the possible. Fantasy is the art of the impossible. Science fiction, again, is the history of…

— Ray Bradbury

Science fiction is essentially a kind of fiction in which people learn more about how to live in the real world, visiting imaginary worlds…

— Brian Stableford

[Science fiction is] the attempt to deal rationally with alternate possibilities in a manner which will be entertaining.

— Lester del Rey

Science fiction is an extension of science.

— Len Wiseman

There is no such thing as science fiction, there is only science eventuality.

— Steven Spielberg

There is only one definition of science fiction that seems to make sense: 'Science fiction is anything published as science fiction.'

— Norman Spinrad

For me science fiction is a way of thinking, a way of logic that bypasses a lot of nonsense. It allows people to look…

— Gene Roddenberry

Science Fiction is the jazz of literature.

— David Brin