Are we alone in the universe? No way, says guest Avi Loeb, a Harvard University astrophysicist and author of a persuasive new book called Extraterrestrial: The First Sign of Intelligent Life Beyond Earth, which focuses on the discovery of Oumuamua in 2017. Loeb argues that the unidentified interstellar object is the first to visit our solar system. On the pod, we talk about the evidence that led him to stake his reputation on his theory, the reason it's so controversial, and why more scientists aren't interested in discovering life beyond our planet. 

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Music and editing by Jesse McInturff