What science fiction movie soundtrack deserves heavy rotation?S

We can't stop listening to the incredibly badass Pacific Rim soundtrack. But there are so many great movie soundtracks in science fiction and fantasy, that can psyche you up to deal with the awfulness of Monday and stir your soul to greatness. What's the movie score that you want to have as the soundtrack to your life?

Please show us the album cover or a nice movie still — or better yet, a Youtube embed including some of the inspiring music from your choice. Thanks!