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Here are a bunch of pages on our website that are tagged parallel universe science fiction
Parallel Universe Science Fiction (SF) is similar to the Multiverse subgenre. In this case, the other universe(s) can be very strange, with differing physical laws, or (number of) spatial dimensions. Isaac Asimov's novel The Gods Themselves is a classic example, with its utterly different intelligent aliens. Greg Egan's novel Diaspora features mind-bending descriptions of a four-dimensional universe.
