Fantasy is unrealistic in the past, future and now (goblins, dwarfs etc.)
Sci-fi is more like this could happen in the future. (virus, aliens etc.)
Starwars is a bit of both. It's a level 3 civilisation. It's very hard to imagine when we are a zero level civilisation on earth. Messing with DNA I believe we can almost create anything.
http://www.youtube.com/watch?v=V7FVjATcqvc







