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Extraterrestrial: The First Sign of Intelligent Life Beyond Earth, by Avi Loeb

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Our civilization has sent five man-made objects into interstellar space: Voyager 1 and Voyager 2, Pioneer 10 and Pioneer 11, and New Horizons.

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Extraterrestrial: The First Sign of Intelligent Life Beyond Earth

Extraterrestrial: The First Sign of Intelligent Life Beyond Earth

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