God said, 'Cancel Program GENESIS.' The universe ceased to exist.

Now I'm a scientific expert; that means I know nothing about absolutely everything.

We always thought the living Earth was a thing of beauty. It isn’t. Life has had to learn to defend itself against the planet’s random geological savagery.

In this single galaxy of ours there are eighty-seven thousand million suns. [...] In challenging it, you would be like ants attempting to label and classify all the grains of sand in all the deserts of the world. [...] It is a bitter thought, but you must face it. The planets you may one day possess. But the stars are not for man.

The Shuttle is to space flight what Lindbergh was to commercial aviation.

I have never grown up, but I will never stop growing.

I sometimes think that the universe is a machine designed for the perpetual astonishment of astronomers.