I sat thinking how terribly sad it was that people are made in such a way that they get used to something as incredible as living. One day we suddenly take the fact that we exist for granted - and then, yes, then we don’t think about it anymore until we are about to leave the world again.

I've nothing against eye make-up and lipstick. But the fact is that we’re actually living on a planet in space. For me that’s an extraordinary thought. It’s mind-boggling just to think about the existence of space at all. But there are girls who can’t see the universe for eye liner.

the very best that can happen is to have energetic opponents. The more extreme they become, the more powerful the reaction they will have to face.

The most subversive people are those who ask questions.

The only thing we require to be good philosophers is the faculty of wonder.

To prove religious faith by human reason is rationalistic claptrap.

When we gaze at a star in the Milky Way which is 50,000 light-years away from our sun, we are looking back 50,000 years in time." "The idea is much too big for my little head." "The only way we can look out into space, then, is to look back in time. We can never know what the universe is like now. We only know what it was like then. When we look up at a star that is thousands of light-years away, we are really traveling thousands of years back in the history of space.