The brightest minds in our field have been trying to find a definition of science fiction for these past seventy years. The short answer is, science fiction stories are given as possible, not necessarily here and now, but somewhere, sometime.
Larry NivenBruce Sterling is one terrific writer and he's relatively new, but I don't know how long he's been doing it; he probably doesn't need the publicity anymore!
Larry NivenOne mark of a good officer, he remembered, was the ability to make quick decisions. If they happen to be right, so much the better.
Larry NivenThere were timelines branching and branching, a mega-universe of universes, millions more every minute. Billions? Trillions? The universe split every time someone made a decision. Split, so that every decision ever made could go both ways. Every choice made by every man, woman, and child was reversed in the universe next door.
Larry Niven