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.
... the stem and the ending. This serves to make the thematic verbs generally more well-behaved. Exponents utilized in verb conjugation include prefixes, suffixes, infixes, ...