"Earth is a small planet, and we are not alone. We are not alone in the universe, and we are not alone on this planet."

"If you are not in awe of the universe, you are not living."

"I'm not saying I'm a superhero, but I do have a cape. It's called a lab coat."

"I'm not trying to be the smartest guy in the room. I'm just trying to be the guy who asks the right questions."

"I'm not a guru. I'm just a guy who knows a lot about space."