Sunshine, about a mission to “trigger a device to save the dying sun,” will be released April 6th.
This sounds even less promising than The Core, which at least involved terra firma, but it was made by Danny Boyle and the team responsible for the excellent 28 Days Later.
Note: while the sun will die, it is not expected to do so for several billion years. If it were dying now, there is very little chance we could do anything about it: even if we set off every nuclear weapon we had, that would be a trivial disturbance compared to the sun’s ordinary energies.