I know: If you're looking down at Earth, you're looking through an atmosphere that has a bit of haze in many places and not just occasional clouds.

Once you've been first, it cannot be done again. Not by you, not by anyone else.

I've been to the Titanic in a yellow submarine and the North Pole in a Russian nuclear ice breaker.

I do celebrity ski races all over the world.

Everyone should take their hats off to Neil Armstrong. He is a humble guy who doesn't wave his own flag.

My own American Dream was to serve my country as best I could and make a difference in America - and in the world.

Astronauts working for the government will always need to be either pilots or mission specialists. Those who want to be pilots should have military experience - ideally, a test pilot background.