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

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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...more

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Birds know, better than humans, not to spoil the nest.

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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...more

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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...more

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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...more

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Across the sea of space, the stars are other suns.

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In all our searching, the only thing we've found that makes the emptiness bearable is each other.

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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 ...more

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Observation: I can’t see a thing.Conclusion: Dinosaurs.

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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 ...more

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Everything not forbidden by the laws of nature, he assured her - quoting a colleague down the hall - is mandatory.

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Adolf Hitler! Ken, it makes me furious. Forty million people die to defeat that megalomaniac, and he's the star of the first broadcast to another civi...more

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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...more

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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 ...more