What are you basing this on? How does Superman die? Because their is no more oxygen to breathe? Honestly, Goku would be killing himself. If he destroys the planet there's no air in space so he'll die & Superman will live on due to the fact that he has survive every possible thing that could kill a hero or human for that matter & has usually came out without a scratch. You phail due to the fact that your brain cannot process the information being given out. Therefore, I think you suffer from mental retardation.