Today we are talking about unidentified flying objects (UFOs.) The Pentagon recently put out a report summarizing everything U.S. intelligence officials have learned about them.

The report clarifies the mysterious objects Navy pilots have reported seeing over the years are real and not illusions. But they still don't know exactly what they are.

We spoke with Professor Avi Loeb about this. He's a Harvard astrophysicist best known for his theory that we've already had an encounter with an alien civilization. Professor Loeb explains why it's unlikely the flying objects were man-made and describes the evidence scientists need to determine once and for all whether we're alone in the universe or not.

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