"Harvard's top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology from a distant star"--
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"Harvard's top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology from a distant star"--
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Add this copy of Extraterrestrial: the First Sign of Intelligent Life to cart. $12.98, good condition, Sold by ThriftBooks-Dallas rated 5.0 out of 5 stars, ships from Dallas, TX, UNITED STATES, published 2021 by Houghton Mifflin.
