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"Provocative and thrilling ... Loeb asks us to think big and to expect the unexpected."-Alan Lightman, New York Times bestselling author of Einstein's Dreams and Searching for Stars on an Island in Maine



Harvard's top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology from a distant star.



In late 2017, scientists at a Hawaiian observatory glimpsed an object soaring through our inner solar system, moving so quickly that it could only have come from another star. Avi Loeb, Harvard's top astronomer, showed it was not an asteroid; it was moving too fast along a strange orbit, and left no trail of gas or debris in its wake. There was only one conceivable explanation: the object was a piece of advanced technology created by a distant alien civilization.



In Extraterrestrial, Loeb takes readers inside the thrilling story of the first interstellar visitor to be spotted in our solar system. He outlines his controversial theory and its profound implications: for science, for religion, and for the future of our species and our planet. A mind-bending journey through the furthest reaches of science, space-time, and the human imagination, Extraterrestrial challenges readers to aim for the stars-and to think critically about what's out there, no matter how strange it seems.



The Harvard astrophysics professor lays out his case that earth had its first contact with extraterrestrial life in 2017, when the first known interstellar object, 'Oumuamua, fitted through our Solar System. This past July, Professor Loeb revealed the Galileo Project, an academic effort to search for evidence of extraterrestrial life. Professor Loeb recently spoke about his new project at the "Our Future in Space" program and expands this argument in a Scientific American article linking 'Oumuamua to the Pentagon's unidentified aerial phenomena (UAP) report. Loeb posits that scientists, not government officials, should be the ones studying UAPs - and that the government cannot rule out the possibility that these objects have extraterrestrial origins without better scientific data.