In Theory with Janna Levin

If something is possible, has the universe tried it? Are all physical possibilities inevitable? Neil deGrasse Tyson sits down with theoretical astrophysicist Janna Levin to launch “In Theory,” a new StarTalk series celebrating the weird, wacky theories of the universe and the theorists who chase them. Out on YouTube October 29, 2026! NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here: https://startalkmedia.com/show/in-theory-with-janna-levin/ Thanks to our Patrons Elamar, Natalia Nelicheva, Kyron Laskosky, Stanley Tai, Jan, Chris Tringali, Nikki Tea, Jay Kapadia, Sean Moran, SnakeSurfer, Roddie, Sam Sillmon, Graham West, Ben Fisk, ChexVC, aitor clemente ramos, Max Forkel, George Fox, and HKRDiary for supporting us this week. Subscribe to SiriusXM Podcasts+ to listen to new episodes of StarTalk Radio ad-free and a whole week early. Start a free trial now on Apple Podcasts or by visiting siriusxm.com/podcastsplus. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.