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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 fourteen-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?

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9781799915812

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Physicist Stephen Webb is best known as author of popular science books. Dan Woren is an American voice actor and Earphones Award-winning narrator. He has worked extensively in animation, video games, and feature films. He is best known for his many roles in anime productions such as Bleach and as the voice of Sub-Zero in the video game Mortal Kombat.

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