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.
... announced by K.
Hirsche in 1874. The four books are not found
in all the manuscripts, nor are they arranged invariably
in the same order.
The work is a manual ...