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The Goldilocks Enigma: Why Is the Universe Just Right for Life?
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The Goldilocks Enigma
If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Seventy-Five Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life
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If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?
An Introduction to Planetary Defense: A Study of Modern Warfare Applied to Extra-Terrestrial Invasion
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An Introduction to Planetary Defense
The Zoologist's Guide to the Galaxy: What Animals on Earth Reveal About Aliens--and Ourselves
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The Zoologist's Guide to the Galaxy