There are too many accidents that can befall life on a single planet.

I don't think the human race will survive the next thousand years, unless we spread into space.

If what we regard as real depends on our theory, how can we make reality the basis of our philosophy? But we cannot distinguish what is real about the universe without a theory. It makes no sense to ask if it corresponds to reality, because we do not know what reality is independent of a theory.

Computers double their performance every month.

We explore because we are human and we want to know. I hope that Pluto will help us on that journey.

What I meant by 'we would know the mind of God' is, we would know everything that God would know, if there were a God. Which there isn't. I'm an atheist.

If at first you don't succeed, try management.