The point is that if the rules aren’t grounded in science, it’s not science fiction. You can have the trappings of science, like space travel or whatever, but if people are moving objects and doing impossible acrobatics by using a magical force, it’s fantasy.
Though not mine, I personally think that definition works better than most. Still, if you pin me down, I’d say that there’s a spectrum, with hard SF (where everything is rigorously anchored to scientific principles) at one end, and pure fantasy (with magic and such) at the other. There are lots of things between those endpoints, with some being closer to one or the other, and some being very much in the middle.
The point is that if the rules aren’t grounded in science, it’s not science fiction. You can have the trappings of science, like space travel or whatever, but if people are moving objects and doing impossible acrobatics by using a magical force, it’s fantasy.
Though not mine, I personally think that definition works better than most. Still, if you pin me down, I’d say that there’s a spectrum, with hard SF (where everything is rigorously anchored to scientific principles) at one end, and pure fantasy (with magic and such) at the other. There are lots of things between those endpoints, with some being closer to one or the other, and some being very much in the middle.