Alien spacecraft, phenomena from another dimension, ghosts, demons of satan, a trick of light - whatever you might believe UFOs to be, they have a long history.

Don is joined by Greg Eghgian for this episode. Professor of History and Bioethics at Penn State University, Greg is the author of 'After the Flying Saucers Came: A Global History of the UFO Phenomenon'. Together with Don, he explores the origins of the 'flying saucer', the end of the stigma against researching UFOs, and much more.

Produced by Sophie Gee. Edited by Aidan Lonergan. Senior Producer was Charlotte Long.

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All music from Epidemic Sounds/All3 Media

American History Hit is a History Hit podcast.