New York Times Bestseller | Wall Street Journal Bestseller | Publishers Weekly Bestseller | Publishers Marketplace 2020 Buzz Book  | Amazon Best Book of the Year | Longlisted for the 2022 PEN/E.O.Wilson Literary Science Writing AwardHarvard’s top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology from a distant star.“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 MaineIn 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