"I think it's important to remind people that we are all made of stardust. We are all connected to the cosmos."

"I would say, if you're not failing, you're not trying hard enough."

"I'm not a philosopher. I'm a scientist. I'm interested in what is, not what should be."

"I'm not saying that science has all the answers. I'm saying that science is the only way we're going to get answers."

"The universe is a magnificent place, and it's all ours to discover."