We went to the moon and discovered Earth.

If you need to invoke your academic pedigree or job title for people to believe what you say, then you need a better argument.

The day that you stop looking - because you're content God did it - I don't need you in the lab. You're useless on the frontier of understanding the nature of the world.

Space enthusiasts are the most susceptible demographic to delusion that I have ever seen.

As a child, I was aware that, at night, infrared vision would reveal monsters hiding in the bedroom closet only if they were warm-blooded. But everybody knows that your average bedroom monster is reptilian and cold-blooded.

If you're a scientist, and you have to have an answer, even in the absence of data, you're not going to be a good scientist.

Curiosity is a self-driven motivation to explore and to learn. Learning is like... you know, you have to take your medicine. And that is what it has become. And that's unfortunate.