Science fiction is a genre of fiction dealing with the impact of imagined innovations in science or technology, often in a futuristic setting. Exploring the consequences of such innovations is the traditional purpose of science fiction, making it a "literature of ideas".
Science fiction is largely based on writing rationally about alternative possibilities. It is similar to, but differs from fantasy in that, within the context of the story, its imaginary elements are largely possible within scientifically established or scientifically postulated laws of nature (though some elements in a story might still be pure imaginative speculation)
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