For the first 20 minutes, Sandra Bullocks' character is doing nothing but hysterically screaming 24/7. She then proceeds to somehow know absolutely nothing about being in space. How she got sent, much less how she was allowed to do a space walk, I will never know. Though the biggest plot hole in this entire movie is the space debris. Every hour and a half it passes just to conveniently destroy every shred of matter, except for whatever the main character is in/or attached to. Interesting concept, but it sucked.