“If you're going to make a science fiction movie, then have a hover craft chase, for God's sake.”

Review http://www.reelviews.net/movies/s/sw1.html of Star Wars Episode IV: A New Hope (1977).
Four star reviews

The Twilight Zone, "The Fugitive" (1962).
The Twilight Zone
Variant: Science fiction is the improbable made possible, and fantasy is the impossible made probable.
Context: It is said that science fiction and fantasy are two different things. Science fiction is the improbable made possible, and fantasy is the impossible made probable.

Interview http://www.locusmag.com/1997/Issues/09/KSRobinson.html in Locus, (September 1997)
Context: Science fiction rarely is about scientists doing real science, in its slowness, its vagueness, the sort of tedious quality of getting out there and digging amongst rocks and then trying to convince people that what you're seeing justifies the conclusions you're making. The whole process of science is wildly under-represented in science fiction because it's not easy to write about. There are many facets of science that are almost exactly opposite of dramatic narrative. It's slow, tedious, inconclusive, it's hard to tell good guys from bad guys — it's everything that a normal hour of Star Trek is not.

Source: Better PowerPoint (R), 2010, p. 24

The Paris Review interview (2010)
Context: Science Fiction is the fiction of ideas. Ideas excite me, and as soon as I get excited, the adrenaline gets going and the next thing I know I’m borrowing energy from the ideas themselves. Science fiction is any idea that occurs in the head and doesn’t exist yet, but soon will, and will change everything for everybody, and nothing will ever be the same again. As soon as you have an idea that changes some small part of the world you are writing science fiction. It is always the art of the possible, never the impossible.

"Subterranean Homesick Alien"
Lyrics, OK Computer (1997)

Boston Book Review interview by Harvey Blume http://www.dorislessing.org/boston.html (February 1998)