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Given the fact that there are perhaps 400 billion stars in our Galaxy alone, and perhaps
400 billion galaxies in the Universe, it stands to reason that somewhere out there, in the
14-billion-year-old cosmos, there is or once was a civilization at least as advanced as our
own. The sheer enormity of the numbers almost demands that we accept the truth of this
hypothesis. Why, then, have we encountered no evidence, no messages, no artifacts of
these extraterrestrials?
In this second, significantly revised and expanded edition of his widely popular book,
Webb discusses in detail the (for now!) 75 most cogent and intriguing solutions to
Fermi's famous paradox: If the numbers strongly point to the existence of extraterrestrial
civilizations, why have we found no evidence of them?
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