The top astronomer at Harvard presents his theory according to which a high-tech alien object from a distant star recently visited our solar system.

In late 2017, scientists at the observatory in Hawaii observed a fleeting object crossing our inner solar system, moving at such a speed that it could only have come from a distant star. Avi Loeb, then Chair of the Astronomy Department at Harvard, showed that it was not an asteroid: it was moving too fast, following an irregular trajectory, and leaving no debris or traces of gases behind. Only one explanation could be given: it was a technological object constructed by a distant extraterrestrial civilization.

In "Extraterrestrial," Loeb tells the fascinating story of the first interstellar visitor detected in our solar system. He describes his theory and its profound implications for science, religion, and the future of our species and planet. An incredible journey to the frontiers of science, spacetime, and human imagination. "Extraterrestrial" invites readers to aim for the stars - and critically examine what lies among them, no matter how strange it may seem.