“Provocative and thrilling ... Loeb asks us to think big and to expect the unexpected.”—Alan Lightman,New York Timesbestselling author ofEinstein’s Dreams andSearching 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 t