Every atom in your body came from a star that exploded. And the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics: you are all stardust.

Forget Jesus. The stars died so that you could be here today.

In 5 billion years, the expansion of the universe will have progressed to the point where all other galaxies will have receded beyond detection.

The purpose of education is not to validate ignorance but to overcome it.

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

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.

For many, to live in a universe that may have no purpose, and no creator, is unthinkable.