As one of the people here who does not primarily speak English, I usually look to the OED for guidance. They use as the primary definition as "Fiction based on imagined future scientific or technological advances and major social or environmental changes, frequently portraying space or time travel and life on other planets."
The future thing complicates it, but otherwise, it seems to fit the genre. But the stories are universal, and could be filmed as westerns, samurai films, or whatever. Which were the original source material.
Fantasy needs the element of magic, but the force qualifies.
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