If we go back to the moon, we're guaranteed second, maybe third place because while we are spending all that money, Russia has its eye on Mars. Landing people on the moon will be terribly consuming of resources we don't have. It sounds great - 'Let's go back. This time we're going to stay.' I don't know why you would want to stay on the moon.

The biggest benefit of Apollo was the inspiration it gave to a growing generation to get into science and aerospace.

When you're in a spacecraft, you need to know what things you can touch and what things you shouldn't touch!

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.

There are always door openings. And gradually, it accumulates. The opportunities open up in front of you.

In Mars, we've been given a wonderful set of moons where we can send continuous numbers of people.

Kids, help your parents if they don't know how to use a smartphone.