UFO report: Are we alone?

On the Sky News Daily podcast with Dermot Murnaghan, we examine how sightings of unidentified flying objects went from conspiracy theory to US government inquiry - after officials told American media they can't confirm or rule out alien activity.

We hear from Sean Cahill, who was the Chief Master-at-Arms on the USS Princeton in 2004 during a UFO encounter, plus 'UFO researcher' Chris Jones and Scotland's Astronomer Royal Prof Catherine Heymans.

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Daily podcast team:

Podcast producer - Annie Joyce

Podcast producer - Nicola Eyers

Podcast producer - Lauren Pinkney

Interviews producer - Tatiana Alderson

Archive - Simon Windsor

Archive - Rob Fellowes

Archive - Nelly Stefanova

Music - Steven Wheeler