Today, in this, the 21st century, bedtime doesn't matter at all. All that matters is what you set for your DVR.

I'm a fan of the planets in any combination. When I was born, Mercury, Venus, Jupiter, Saturn, Uranus, Neptune, Pluto, the Sun, and the Moon were all in the sky.

With no gravitational force to work against, your body not only doesn't need the same amount of muscle and bone, it starts breaking them down. As on Earth, so in space: use it or lose it. And exercise may not solve the problem.

Astrophysicists perfected navigation. We perfected all these things that matter to the power of nations manifest on the world stage. So we want to go into space. That's the new high ground, right? We care about multispectral imaging of things. Well, that's what reconnaissance wants to do. So our expertise has been in bed with national security needs forever. So maybe, secretly, that's why they keep us employed.

The only accounting we had of the origins and the structure of nature was Biblical Genesis.

We went to the moon using just Newton's laws of motion and gravity. Newtonian dynamics we call it. So then we find out, "Well, this works because there's certain regimes we've never tested it in." Had we done so, we would show that it didn't work: For example, at very high speeds, very high gravity, Newton's laws fail. They just fail. You need Einstein's laws of motion and gravity. Those would be his special theory of relativity and general theory of relativity. Now you invoke those and it works.

Dark matter and dark energy are two things we measure in the universe that are making things happen, and we have no idea what the cause is.