"If you want to understand the universe, you have to be willing to ask the tough questions."

"Science is not just a collection of facts, but a way of thinking."

"I'm not saying there are no aliens. I'm just saying the evidence is insufficient for me to conclude it."

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

"I don't have a problem with people believing in God. I have a problem with people believing in things that are demonstrably false."