Great thread
So many memories being revived (phase IV... was looking for that name for a good decade now!)
Guardians of the galaxy
Pandorum
Lost in space
Ender's game was not half as good as the book, but still worth mentioning.
Star Wars VII previews are being released today. Still have to wait a year to see it, though (argh!)
Brazil (1985):
Not fiction, but a great fantasy film that will definitely take you to a different world: Stardust.
Funny... the last 2 I mention feature Robert De Niro in what is probably his 2 least conventional characters and are almost 30 years apart...