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You're listening to Scientific American Science Quickly.

I'm Dan Vergano.

For the past decade, reports of UFO sightings of filled headlines and news broadcasts,

and some of these have come from a surprising place.

The Pentagon.

Former defense officials have made a number of claims about and released videos of strange sightings made by military pilots. These days, the objects are officially called

UAP, unidentified anomalous phenomena. But regardless of the new branding, Congress has demanded

answers on these objects, especially after one former official this summer claimed that he believed that the U.S. possessed non-human spacecraft and possibly their dead pilots.

We're talking today to the former intelligence official and physicist Sean Kirkpatrick, who until December headed the Pentagon office that the Congress told to find some answers to all this.

He recently published

an op-ed in Scientific American called, Here's what I learned as the U.S. government's UFO hunter.

Hi, Sean. Welcome to the podcast. Thanks, Dan. I'm glad to be here. Can you talk a little bit

about your office's search through past records, what you find

and what Congress asked you to look for?

Sure.

Congress really gave us two main missions.

There's an operational mission, which is to investigate contemporary sightings with military pilots, operators, sensors, to understand what's happening in our domain.

...