You’d have to be living on another planet not to have heard one of the biggest news stories in recent times: After years of denial, it turns out that the US government has a secret program, researching and investigating UFOs.

The conspiracy theorists were right all along.

The story broke in December 2017 and generated unprecedented mainstream media coverage of the UFO phenomenon, which continues to this day, as the story continues to unfold. This coverage includes The Post’s new docu-series “The Basement Office,” which delves into this story as part of a wider investigation of the UFO mystery.

The Pentagon’s secret UFO program was called AATIP — Advanced Aerospace Threat Identification Program. The title cleverly blurred the lines between next-generation aviation threats and the phenomena they were really studying. Maybe as an unintended consequence, but perhaps by design, the cryptic title also kept the program hidden from the numerous people who make Freedom of Information Act requests about “UFOs.” AATIP was set up in 2007, largely on the initiative of the then-Senate majority leader, Harry Reid. When AATIP’s existence was revealed, Reid tweeted: “The truth is out there. Seriously.”

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