Sunshine - 7

Danny Boyle and writer Alex Garland (28 Days Later) team up again to make a great science-fiction film. A crew of 8 astronauts (Cilliam Murphy, Chris Evans, and Michelle Yeoh) are on a ship, Icarus 2, travelling to re-ignite the sun in order to save earth from an ice age. They are not the first to be sent and when they decide to board Icarus 1, they feel the stress of having to make further life and death decisions (you will have to see it to get more, I don't want to spoil it).
It uses very unique cinematography, the score is beautiful and haunting, and the philosophical questions it engages are intriguing. Because the sun is so basic to human life it becomes for some of the crew a religious experience. And the ultimate question and justification for humans trying to prolong their own survival is one that is not often brought up. Both visually stunning and thoughtful- a great combination. As sci-fi films go this is on the level of Alien, and probably a little short of 2001: A Space Odyssey (yes I know, I should have given it a 7).