[Science fiction is] that class of prose narrative treating of a situation that could not arise in the world we know, but which is hypothesised on the basis of some innovation in science or technology, or pseudo-science or pseudo-technology, whether human or extra-terrestrial in origin. It is distinguished from pure fantasy by its need to achieve verisimilitude and win the 'willing suspension of disbelief' through scientific plausibility.
Kingsley AmisWork was like cats were supposed to be: if you disliked and feared it and tried to keep out if its way, it knew at once and sought you out and jumped on your lap and climbed all over you to show how much it loved you. Please God, he thought, don't let me die in harness.
Kingsley Amis