Most sets of values would give rise to universes that, although they might be very beautiful, would contain no one able to wonder at that beauty.

The victim should have the right to end his life, if he wants. But I think it would be a great mistake. However bad life may seem, there is always something you can do, and succeed at. While there's life, there is hope.

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

The large-scale homogeneity of the universe makes it very difficult to believe that the structure of the universe is determined by anything so peripheral as some complicated molecular structure on a minor planet orbiting a very average star in the outer suburbs of a fairly typical galaxy.

The universe is governed by science. But science tells us that we can't solve the equations, directly in the abstract.

It is all right to make mistakes; nothing is perfect because with perfection, we would not exist.

You cannot predict the future.