When was the last time a NASA mission went according to plan? It cost $1 billion, required unbelievably precise work in zero gravity, and now, against all odds, the Hubble telescope is better than ever. NASA scientists could not hide their excitement at the potential discoveries possible with the upgrade, which will yield new data from the depths of space for the next five years. The astronauts carrying out the repairs were met with several bumps in the road, including running over schedule on several repairs. One grueling session lasted eight hours and required one of the astronauts to return to the shuttle to refill his air tank. The crew is expected to return to earth on Friday.