Space can be mapped and crossed and occupied without definable limit; but it can never be conquered.

If man can live in Manhattan, he can live anywhere.

Before the current decade ends, fee-paying passengers will be experiencing suborbital flights aboard privately funded vehicles. . . . It won't be too long before bright young men and women set their eyes on careers in Earth orbit and say: "I want to work 200 kilometers from home-straight up!"

In this universe the night was falling; the shadows were lengthening towards an east that would not know another dawn. But elsewhere the stars were still young and the light of morning lingered; and along the path he once had followed, Man would one day go again.

Can the synthesis of man and machine ever be stable, or will the purely organic component become such a hindrance that it has to be discarded?

I am an optimist. Anyone interested in the future has to be otherwise he would simply shoot himself.

Floyd could imagine a dozen things that could go wrong; it was little consolation that it was always the thirteenth that actually happened.