You dig deeper and it gets more and more complicated, and you get confused, and it's tricky and it's hard, but... It is beautiful.

In a sense I feel very much a part of the cinema now in a way where when I come back to the theater now I feel like a visitor. The cinema is really what I enjoy. I want to do more independent movies.

We have written the evidence of our existence onto the surface of our planet. Our civilisation has become a beacon, that identifies our planet as home to life.

Skepticism must go hand in hand with rationality. When theories are shown to be false, the correct thing to do is to move on.

What scientists are attached to is journeys into the unknown and discovering things that are completely unexpected and baffling and surprising.

Don't undermine the science just because you don't like the economics. That's a dangerous slope, because the problem of course is you're not undermining just that, you're undermining the basis of rational decision-making in society.

(On the energy radiated by the Sun) It's four hundred million million million million watts. That is a million times the power consumption of the United States every year, radiated in one second, and we worked that out by using some water, a thermometer, a tin, and an umbrella. And that's why I love physics.