Neil deGrasse Tyson and comic co-host Eugene Mirman answer fan submitted Cosmic Queries with Matt O’Dowd, astrophysicist and host of @pbsspacetime, about vacuum decay, mapping the galaxy, diamond planets, a simulation universe and much, much, more! Watch Neil's guest appearance on Matt's channel: https://www.youtube.com/watch?v=hmVOV7xvl58 Support us on Patreon: https://www.patreon.com/startalkradio Subscribe to StarTalk: https://www.youtube.com/user/startalkradio?sub_confirmation=1 Follow StarTalk: Twitter: http://twitter.com/startalkradio Facebook: https://www.facebook.com/StarTalk Instagram: https://www.instagram.com/startalkradio/ 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