The moon is the first milestone on the road to the stars.

My favorite definition of an intellectual: 'Someone who has been educated beyond his/her intelligence'.

I have great faith in optimism as a guiding principle, if only because it offers us the opportunity of creating a self-fulfilling prophecy.

A well-stocked mind is safe from boredom.

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

The person one loves never really exists, but is a projection focused through the lens of the mind onto whatever screen it fits with least distortion.

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.