Mars has a bit of air pressure; maybe we can build up that atmosphere to be a bit more accommodating to humans.

I didn't start skiing until I was 50. My wife Lois taught me how to ski. I'm proficiently conservative.

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?

On Apollo 11 in route to the Moon, I observed a light out the window that appeared to be moving alongside us. It was either the rocket we had separated from, or the 4 panels that moved away when we extracted the lander from the rocket and we were nose to nose with the two spacecraft. So in the close vicinity, moving away, were 4 panels. And i feel absolutely convinced that we were looking at the sun reflected off of one of these panels.

Timing has always been a key element in my life. I have been blessed to have been in the right place at the right time.

I think humans will reach Mars, and I would like to see it happen in my lifetime.

As someone who flew two space capsules and twice landed in the ocean, I can attest from personal experience how much logistics work is needed to get you home.