Sunshine 2007
Fifty years into the future, the sun is dying, and Earth is threatened by arctic temperatures. A team of astronauts is sent to revive the Sun — but the mission fails. Seven years later, a new team is sent to finish the mission as mankind’s last hope.
Spoilers for Sunshine
Submitted by: megamuh
On a mission to save the human race, one of the astronauts chosen is a psycho, no screening was apparently required. But they do actually succeed in saving the sun anyways, so it's all good!