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

We really didn't devote a lot of time to investigating the scariest aspects of our flight. It was more challenging and productive to concentrate on the remedies, and leave things that couldn't be solved to happen without thinking about them. There is a morbid human curiosity associated with tragic death-producing events. Though naturally, this needs to be kept in perspective.

I don't watch 'American Idol,' but I wouldn't call it 'undignified.'

I am excited to think that the development of commercial capabilities to send humans into low Earth orbit will likely result in so many more Earthlings being able to experience the transformative power of space flight.

I don't believe any pair of people had been more removed physically from the rest of the world than we were.

What comes after the moon? I think you can guess: Mars.

When I was a little kid, we only knew about our nine planets. Since then, we've downgraded Pluto but have discovered that other solar systems and stars are common. So life is probably quite prevalent.