"All civilizations become either spacefaring or extinct."
"Any sufficiently advanced technology is indistinguishable from magic."
"We are called to be architects of the future, not its victims."
"The future is here. It's just not widely distributed yet."
"Houston, Apollo 11 . . . I've got the world in my window."
"Our only chance of long-term survival is...to spread out into space."
"The creative conquest of space will serve as a wonderful substitute for war."
"Earth is just too small and fragile a basket for mankind to keep all its eggs in."
"The extension of life beyond Earth is the most important thing we can do as a species."