Go to https://ground.news/startalk to stay fully informed on the latest Space and Science news. Subscribe through our link for 50% off unlimited access to the Vantage plan this month. Are alien spacecraft here on Earth? Neil deGrasse Tyson and comedian Chuck Nice discuss the UAP hearings, unexplained cosmic phenomena, dark matter, and more with astrophysicist and NASA UAP chair David Spergel. David reveals what it’s like to investigate UFOs scientifically, explaining why most sightings turn out to be lens flares or misidentified objects— but also why the 1% of unexplained events still intrigue researchers. Learn how smartphones and apps could revolutionize data collection, making it easier to authenticate and analyze potential UAP sightings. Plus, discover why phenomena like ball lightning and lightning sprites were initially dismissed, only to be explained later with better technology. Switching gears, Neil and David dive into dark matter and energy. Learn how groundbreaking tools like the Nancy Grace Roman Space Telescope and collaborations with ESA’s Euclid mission aim to answer fundamental questions about the universe. We discuss computational astrophysics and the Atlas of Peculiar Galaxies. From UFOs to cutting-edge astrophysics, this episode offers a clear-eyed look at the mysteries of the universe. Timestamps: 00:00 - Introduction: David Spergel 01:45 - How Much is Unexplained? 9:07 - The UAP Hearings 13:51 - Would NASA Keep the Aliens Secret? 18:28 - Conspiracy & Eyewitness Testimony 31:19 - Dark Matter & The Nancy Grace Roman Telescope 40:07 - Star Evolution & Computational Astrophysics 44:56 - Dark Matter & Dark Energy 48:39 - Gravitational Waves at the Begining of the Universe 53:04 - A Cosmic Perspective Check out our second channel, @StarTalkPlus Get the NEW StarTalk book, 'To Infinity and Beyond: A Journey of Cosmic Discovery' on Amazon: https://amzn.to/3PL0NFn Support us on Patreon: https://www.patreon.com/startalkradio FOLLOW or SUBSCRIBE to StarTalk: Twitter: http://twitter.com/startalkradio Facebook: https://www.facebook.com/StarTalk Instagram: https://www.instagram.com/startalk About StarTalk: Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up! #StarTalk #NeildeGrasseTyson