Science fiction is a genre that uses strange worlds and inventions to illuminate our reality — sort of the opposite of a lot of other writing, which uses the familiar to build a portrait that cumulatively shows how insane our world actually is. People, especially early twenty-first century people, live in a world where strangeness lurks just beyond our frame of vision — but we can’t see it by looking straight at it. When we try to turn and confront the weird and unthinkable that’s always in the corner of our eye, it vanishes. In a sense, science fiction is like a prosthetic sense of peripheral vision.
Because science fiction can be set in a future time, distant planet, or world, and can involve almost anything you can think of, it is a perfect place for philosophers to mess with ideas.