I'm convinced that sending people to Mars is so expensive that if you go once and bring the people back and then go again and bring the people back, we're eventually going to run out of money. But what if we send people the first time and they don't come back? What if they stay there?
Buzz AldrinThere were about six years when there was not one American who went into space. We shouldn't do that again.
Buzz Aldrin