When we get there, if we don't find any life on Mars, from that point on there will be life on Mars because we'll bring it there, whether it's germs and leftover urine bags, whatever it is.

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

The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.

The universe is the way it is. It's not going to be changed by supplications.

When I am getting ready to cross a street, I look both ways before crossing. My bones, my muscles, are not what they used to be, so I am careful when I go up and down stairs, because I've heard stories of older people falling and having very disabling injuries. I have enough things that begin to go a little bit wrong as I get a little bit older.

For a million dollars, the Russians would take two people, a million apiece, around the moon and back. However, stories, videos that come from the space station, and other people, are a great inspiration to young people for an exciting career field.

Only a large-volume market like space travel can attack the barrier of high costs.