“Science fiction is the art of the possible not the impossible.”

“Science fiction deals with improbable possibilities, fantasy with plausible impossibilities.”

“Fantasy is the impossible made probable. Science Fiction is the improbable made possible.”

“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.”

“Science fiction films are not about science. They are about disaster, which is one of the oldest subjects of art.”

“Science fiction is the arena of the not-yet, and every science fiction story has this element of not-yet-ness — usually a bit of technology or a scientific discovery that we don't know about in the real world of the present but that might be a possibility in the future.”