We still refer to sunrise, sunset. That only has meaning if you think that Earth is in the center of things, and everything is moving around us. So even though we know intellectually Earth goes around the sun, the language is still pre-Copernican, as we would call it.

I can tell you that in my modern life I enjoy language. I enjoy words, their meaning, what they sound like to the ear, what they sound like to the listener. I strive to write the perfect sentence in all that I do, and when I write [the] perfect sentence I know it. If I had a second life I'd be a librettist for Broadway musicals.

Robots are important also. If I don my pure-scientist hat, I would say just send robots; I'll stay down here and get the data. But nobody's ever given a parade for a robot. Nobody's ever named a high school after a robot. So when I don my public-educator hat, I have to recognize the elements of exploration that excite people. It's not only the discoveries and the beautiful photos that come down from the heavens; it's the vicarious participation in discovery itself.

My interest in the space program has a certain purity to it because I recognize the romance of it but I was never seduced by it. That allowed me to view it through a more purely scientific lens. My interest in space while in school came about through my scientific activities.

You gotta be a good sport! So when I would lose, I would say, "That guy was better than I was; what do I have to do to be better next time?"

... there is no shame in not knowing. The problem arises when irrational thought and attendant behavior fill the vacuum left by ignorance.

I try to keep this in mind when tied in to a rope 75 feet up in a tree... The history of ideas about our place in the universe has been a long series of let-downs for those who like to believe we are special.