"The greatest value of a human life is to ask questions."

"You know, the nice thing about science is that it’s an equal-opportunity destroyer of belief systems."

"I don't think there's any such thing as a 'dumb question' when it comes to science. There are just questions that reveal a lack of information."

"My goal is to get people to think — to understand that the universe is larger than them and their problems."

"When you look at the universe, you realize how insignificant we are. But then you realize how significant we are, because we are the universe looking at itself."