Light is the only connection we have with the Universe beyond our solar system, and the only connection our ancestors had with anything beyond Earth. Follow the light and we can journey from the confines of our planet to other worlds that orbit the Sun without ever dreaming of spacecraft. To look up is to look back in time, because the ancient beams of light are messengers from the Universe's distant past.

The aim of particle physics is to understand what everything’s made of, and how everything sticks together. By everything I mean me and you, the Earth, the Sun, the 100 billion suns in our galaxy and the 100 billion galaxies in the observable universe. Absolutely everything.

Look at that! If you ever needed convincing that we live in the solar system, that we are on a ball of rock, orbiting around the Sun with other balls of rock, then look at that! That's the solar system coming down and grabbing you by the throat.

Feudal societies don't create great cinema; we have great theatre. The egalitarian societies create great cinema. The Americans, the French. Because equality is sort of what the cinema deals with. It deals with stories which don't fall into 'Everybody in their place and who's who,' and all that. But the theatre's full of that.

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.

Climate change: Don't undermine the science just because you don't like the economics

At every stage of understanding the universe better, the benefits to civilisation have been immeasurable. None of those big leaps were made with us knowing what was going to happen.