"Provocative and thrilling ... Loeb asks us to think big and to expect the unexpected."—Alan Lightman,New York Timesbestselling author ofEinstein's DreamsandSearching for Stars on an Island in MaineHarvard'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.InExtraterrestrial, Loeb takes readers inside the thrilling story of the first interstellar...