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Originally Posted by Belle2Be
So, couldn't you say that it is all science fiction? Who can really say that time travel/space ships/ aliens/ magic will NEVER happen? Even goblins or unicorns could develop from some virus or something that scientists develop.
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And what about parallel universes?
There are cosmologists who take the possibility seriously, so the relevant hypotheses would seem to fit with the more stringent definitions of science fiction. (In
Heroes Die much of the story takes place in an accessible parallel universe that has a typical fantasy bent, though the frame is dystopian science fiction.)