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.

The story of the universe finally comes to an end. For the first time in its life, the universe will be permanent and unchanging. Entropy finally stops increasing because the cosmos cannot get any more disordered. Nothing happens, and it keeps not happening, forever. It's what's known as the heat-death of the universe. An era when the cosmos will remain vast and cold and desolate for the rest of time the arrow of time has simply ceased to exist. It's an inescapable fact of the universe written into the fundamental laws of physics, the entire cosmos will die.

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.

For me, Woody Allen's 'Manhattan' defines New York. Both New York and Manhattan Island should be in black in white! I always hear the soundtrack of Gershwin in my head every time I go over the Queensboro Bridge, or come in from JFK because of it!

If people don’t have an understanding of what science is and what scientists do, then they can tend to think that global warming, for example, is just a matter of opinion.

(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.

There is so much left of it to explore.