Physics limits and atmospheric interactions

In the wake of Obama's on-air revelation that he believes in aliens and Trump's move to declassify government UFO documents, UnHerd invites two world experts to make the best case for hope and doubt about extraterrestrial life. Michael Shermer, Skeptic magazine founder and author of the new book Truth (https://www.amazon.co.uk/Truth-What-Find-Still-Matters/dp/142145372X), and Harvard astronomer Prof. Avi Loeb ask: are we alone in the universe?

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