I love sci-fi and really wanted to see a good sci-fi film. But THIS IS NOT IT. The science and physics they try to convince people of is absurd. I can usually suspend disbelief when the film is clearly fantasy, but when they try to be 'scientific' about it and fail miserably, I just want to puke.

First, there is way the training would only last 6 months. Second, there wouldn't be someone as incompetent as the person Sandra Bullock plays.

From one laughable scene to another the film descends into absurdity pretty fast.

If you don't care about any semblance of reality in a film that wants so hard to be believable, then this is fine. Otherwise don't waste your time.