Julie Payette

I'm 9, 10, and I'm watching the Apollo astronauts go to the moon. We're sitting on the floor of a school, and they have this... huge TV, and I'm looking at that, and I'm thinking 'Me, I would like to do that.' But it didn't dawn on me then that they were American; I was Canadian. They were men; I was a girl. They were test pilots, military folks.

If you're in space on the way to Mars, and a conflict develops... you can't turn around and go back, because Earth is already gone on its orbit.