Comment by sethammons
Comment by sethammons a day ago
> The difference between science fiction and fantasy…is simply this, science fiction has rivets, fantasy has trees.
-- Orson Scott Card
There is hard and soft types that muddy the quote, but it largely stands.
Another definition that almost works is the distinction between Not-Yet-Possible and Never-Possible - although this may fail when things like Faster-Than-Light drives are considered.