Science fiction - and the correct shortcut is 'sf' - uses actual scientific facts or theories for the source ideas or framework of the story. It has some scientific content, however speculative. If it breaks a law of physics, it knows it's doing so and follows up the consequences. If it invents a society of aliens, it does so with some respect for and knowledge of the social sciences and what you might call social probabilities. And some of it is literarily self-aware enough to treat its metaphors as metaphors.
Ursula K. Le GuinMeeting writers is always so disappointing. I got over wanting to meet live writers quite a long time ago. There is this terrific book that has changed your life, and then you meet the author, and he has shifty eyes and funny shoes and he won't talk about anything except the injustice of the United States income tax structure toward people with fluctuating income, or how to breed Black Angus cows, or something.
Ursula K. Le Guin