"I'm an agnostic. I'm not an atheist, because I don't know enough to be an atheist."

"The universe is not just big. It's vast."

"It's not about what you know, it's about what you can prove."

"The universe is an amazing place, and it's full of surprises."

"I'm not a fan of the idea of 'alternative facts.' Facts are facts. There's no alternative to them."