In a new interview with the Israeli newspaper Haaretz, the chair of Harvard University’s Astronomy Department Avi Loeb defended his controversial hypothesis that the interstellar object known as ‘Oumuamua could be an alien probe — and speculated at length about the place of humanity in the cosmos.

“As soon as we leave the solar system, I believe we will see a great deal of traffic out there,” he told Haaretz. “Possibly we’ll get a message that says, ‘Welcome to the interstellar club.’ Or we’ll discover multiple dead civilizations — that is, we’ll find their remains.”

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