"Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become space...












Across the sea of space, the stars are other suns.
More Carl Sagan quotes
"There is a wide yawning black infinity. In every direction the extension is endless, the sensation of depth is overwhelming. And the darkness is immor...
"Birds know, better than humans, not to spoil the nest.
"For all its material advantages, the sedentary life has left us edgy, unfulfilled. Even after 400 generations in villages and cities, we haven’t forgo...
"Billions of years from now our sun, then a distended red giant star, will have reduced Earth to a charred cinder. But the Voyager record will still be...
"The suppression of uncomfortable ideasmay be common in religion and politics, but it is not the path to knowledge; it has no placein the endeavor of s...
"In all our searching, the only thing we've found that makes the emptiness bearable is each other.
"The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and ...
"Observation: I can’t see a thing.Conclusion: Dinosaurs.
"The dangers that we face are part of the process, now well underway, of the unification of the planet--in language, culture, science, and commerce. Th...
"Our television signals leave this planet and go out into space...the signals spread out from the earth in spherical waves, a little like ripples in a ...
"The others would then fall silent and she would continue about doped gallium arsenide detectors, or the ethanol content of the galactic cloud W-3. The...
"Everything not forbidden by the laws of nature, he assured her - quoting a colleague down the hall - is mandatory.
"At the very moment that humans discovered the scale of the universe and found that their most unconstrained fancies were in fact dwarfed by the true d...
"Let's see if I got this right," she would say to herself. "I've taken an inert gas that's in the air, made it into a liquid, put some impurities in a ...