People are interested in science, but they don't always know they're interested in science, and so I try to find a way to get them interested.

Nothing can create something all the time due to the laws of quantum mechanics, and it's - it's fascinatingly interesting.

It really is the most poetic thing I know about physics: you are all stardust.

When a person's religious beliefs cause him to deny the evidence of science, or for whom public policy morphs into a battle with the devil, shouldn't that be a subject for discussion and debate?

If our species is to survive, our future will probably require outposts beyond our own planet.

Metaphysical speculation is independent of the physical validity of the Big Bang itself and is irrelevant to our understanding of it.

I hope that every [person] at one point in their life has the opportunity to have something that is at the heart of their being, something so central to their being that if they lose it they won't feel they're human anymore, to be proved wrong because that's the liberation that science provides. The realization that to assume the truth, to assume the answer before you ask the questions leads you nowhere.