Are we thinking about the fundamentals of the universe wrong? Neil deGrasse Tyson and co-hosts Chuck Nice and Gary O’Reilly answer grab bag questions about aliens, gravitons, and the big unknowns with astrophysicist Charles Liu. We discuss quantum field theory and string theory. What questions do Neil and Charles want answered during their lifetimes? We explore the Fermi Paradox and the existence of life unlike our own on Earth. Could super-intelligent aliens be encoding signals to look like noise? Plus, would the transferring of mass during time travel cause an explosion? Could aliens be sending messages right under our nose? Learn how Charles uses AI in the classroom, what a graviton is, and the nature of Hawking radiation. Discover how the universe may be woven out of wormholes. Could the universe be expanding due to suction? Where is the center of the universe? Are we creating energy or just redistributing it? We talk about where fossil fuels energy comes from, time dilation, and our vantage point in the universe. All that, plus, discover the largest object in the universe. Thanks to our Patrons Karim Beydoun, Sture Seljelund, Ken Hays, Kasi Kanniah, Dillon, Mandi McKay, and Phillida Hutcheson for supporting us this week. NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free. 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 Timestamps: 00:00 - Grab Bag with Charles Liu 1:40 - Quantum Field Theory 4:57 - The Unknowns We Want Answered 12:40 - Mass-Energy Conversion in Time Travel 16:28 - Could We Be Bombarded With Alien Transmissions And Not Know it? 21:15 - Do We Need Gravitons? 24:45 - Event Horizons & Virtual Particles 30:47 - Could Expansion Be Suction? 35:45 - Moving at the Speed of Light & Time Dilation 37:12 - Our Vantage Point in the Observable Universe 40:12 - Do We Create Energy or Just Redistribute it? 44:05 - What Is The Largest Object in The Universe?