Could aliens actually exist? Is there any chance they’ve visited Earth already? What really happened at Roswell? The truth... is right here. We talked to astronomers Dr. Jill Tarter, Dr. Seth Shostak, investigative journalist David Clarke, and physicist Prof. Jim Al Khalili.

Check out the full transcript here: http://bit.ly/2PqOHRj

Selected readings: Seth’s account of that day in 1997 The “Condon report”-- a 1968 effort to go through and identify all UFO sightings The Roswell Report This paper estimating how many planets are in the “Goldilocks” zone A good read on wormholes and their history; a tough read on how we might use them to teleport

Credits: This episode has been produced by our senior producer Kaitlyn Sawrey, as well as Wendy Zukerman and Rose Rimler, with help from Shruti Ravindran and Meryl Horn. Fact checking by Michelle Harris and Meryl Horn. Music by Bobby Lord and Emma Munger. Editing by Blythe Terrell. Additional editing help from Caitlin Kenney. We performed this live for GimletFest - and we were joined onstage by our Aussie mate and mathematician Adam Spencer who has his own podcast you should check out ‘The Big Questions’, and astronomer Dr Emily Rice, who helps run Astronomy on Tap which brings together astronomers and beer. Check it out to see whether it runs in your city. Also thanks to Dr. Ravi Kumar Kopparapu, Dr. Craig O'Neill, Dr. Jessie Christiansen, Dr. Cameron Hummels, Dr. Phil Hopkins, Dr Avi Loeb, and the many other researchers who helped us on this.

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UFOs: What the Government Covered Up