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

At the core of the risk-free society is a self-indulgent failure of nerve.

Exploration is wired into our brains. If we can see the horizon, we want to know what's beyond.

I think there would be no shortage of applicants to the government astronaut corps to be settlers on the planet Mars. And I think this would be very inspiring.

I'm in favor of changing the destination of humans. There are a lot of manned missions that can be done, but not in the direction of the moon.

Unfortunately, kids are led to believe things are easier to achieve than they really are.

Computers allow us to squeeze the most out of everything, whether it's Google looking up things, so I guess that tends to make us a little lazy about reading books and doing things the hard way to understand how those things work.