The remarkable feature of physical laws is that they apply everywhere, whether or not you choose to believe in them. After the laws of physics, everything else is opinion.

Humans aren't as good as we should be in our capacity to empathize with feelings and thoughts of others, be they humans or other animals on Earth.

Feeling a little small? Well, in the context of the cosmos, we are small.

Going into orbit around Earth - where the space station is today, and where the space shuttles and John Glenn and all those folks go-that's three-eighths of an inch above a schoolroom globe, just FYI. That's not very far from Earth. Yes, you are off Earth, but you're not really going anywhere yet. The moon was the only real destination.

The people that first climbed Mt. Everest weren't scientists, right, they were adventurers. If you're an adventurer, you want to go yourself. It's different than a scientist, who is simply wanting to learn.

The greatest of people that have ever been in society, they were never versions of someone else. They were themselves.

When we went to the moon and realized that the Soviet Union had no realistic plans of getting to the moon, then we stopped going to the moon.