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 GuinA panda walks into a tea room and ordered a salad and ate it. Then it pulled out a pistol, shot the man in the next table dead, and walked out. Everyone rushed after it, shouting "Stop! Stop! Why did you do that?" "Becuase I am a panda," said the panda. "That's what pandas do. If you don't believe me, look in the dictionary." So they looked in the dictionary and sure enough they found Panda: Racoon-like animal of Asia. Eats shoots and leaves.
Ursula K. Le GuinIn our loss and fear we craved the acts of religion, the ceremonies that allow us to admit our helplessness, our dependence on the great forces we do not understand.
Ursula K. Le GuinBut now his dry and silent grieving for his lost wife must end, for there she stood, the fierce, recalcitrant, and fragile stranger, forever to be won again.
Ursula K. Le GuinLiving in a world that is valued only as gain, an ever-expanding world-as-frontier that has no worth of its own, no fullness of its own, you live in danger of losing your own worth to yourself. That's when you begin to listen to the voices from the other side, and to ask questions of failure and the dark.
Ursula K. Le Guin