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Try to leave the Earth a better place than when you arrived.

If I leave this Earth, I want to leave this Earth just knowing I've tried to give something back and tried to do something worthwhile with myself.

Land on Mars, a round-trip ticket - half a million dollars. It can be done.

Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.

We are not going to be able to operate our Spaceship Earth successfully nor for much longer unless we see it as a whole spaceship and our fate as common. It has to be everybody or nobody.

Astronautics, strictly speaking, will be concerned with voyages to other stars. Remarkably enough, to achieve such feats, we might not even have to leave the earth. It would suffice to accelerate the sun itself to a very high speed and let it drag all its planets with it.

To try to really land a spacecraft really on another world is really difficult, and if we lose that ability, it's going to be heartbreaking.

You don't live on the Earth you want, you live on the Earth you have.