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.
... population density is 365.9/km² (938.3/mi²). There are 163 housing units at an average density of 143.0/km² (366.8/mi²). The racial makeup of the ...