[KaVir]

You've got magic and wizards, knights fighting with swords, princesses in need of rescue...classic fantasy elements. Also note that (as Drealoth pointed out) Star Wars is set in the distance past, not in the future.

Conversely, the imaginary elements in science fiction are more or less possible (or at least believably so) within scientifically established laws of nature.

To quote Rod Serling, "science fiction makes the implausible possible, while science fantasy makes the impossible plausible."

Other books of interest include "Worlds of The Golden Queen" by David Farland and "Lord of Light" by Roger Zelazny, both of which start out as typical fantasy but later include strong science fiction elements.

Any game which includes magical or supernatural elements might be classified as fantasy. I guess you could include the various Harry Potter muds, the WoD muds, the Star Wars muds, etc.