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

[The writers of the holy books] did not even know the earth revolves around the sun. Why are we listening?

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.

Now, almost one hundred years later, it is difficult to fully appreciate how much our picture of the universe has changed in the span of a single human lifetime. As far as the scientific community in 1917 was concerned, the universe was static and eternal, and consisted of a one single galaxy, our Milky Way, surrounded by vast, infinite, dark, and empty space. This is, after all, what you would guess by looking up at the night sky with your eyes, or with a small telescope, and at the time there was little reason to suspect otherwise.

The real thing that physics tell us about the universe is that it's big, rare event happens all the time — including life — and that doesn't mean it's special.

We all trust each other to some extent. We have to rely on experts to some extent, but we should learn to be sceptical.

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