A zero-gravity flight is a first step toward space travel.

Science is not only a disciple of reason but, also, one of romance and passion.

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

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.

Why are we here? Where do we come from? Traditionally, these are questions for philosophy, but philosophy is dead.

I have sold more books on physics than Madonna has on sex.

All that my work has shown is that you don't have to say that the way the universe began was the personal whim of God.