Why are planets round? Neil deGrasse Tyson and comedian Chuck Nice explain why the universe keeps creating spheres. What is so special about spheres? We explore why soap bubbles, cold pigeons, planets, and the sun are all round. Learn about asteroid Ceres’ upgrade to dwarf planet and how Saturn got its rings. We also get into disks: why are some object spheres and other are disks? 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 00:00 - Introduction: The Universe Love Making Round Things 00:48 - Surface Tension in Soap Bubbles 2:34 - Why Birds Get Round 3:43 - Why Planets & Stars Are Spherical 6:25 - Ceres & Spheres in Zero Gravity 8:25 - How Planets Have Rings 10:09 - Galactic Disks