Strictly speaking, every science fiction tale presents its own version of future and therefore there are as many science fiction universes as there are science fiction stories. Many SF tales follow dictates of a particular subgenre like Cyberpunk or Space Opera of which, see the separate entry.
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Sakhalin
Sakhalin (also Saghalien), a large elongated island in the North Pacific, lying between 45° 50' and 54° 24' N, off the coast of the Russian ...