Neil deGrasse Tyson: Why Kepler-37b Is a Planet and Pluto Isn't

Why is Kepler-37b an exoplanet while Pluto has been demoted to a dwarf planet? It turns out size isn't everything, as astrophysicist Neil deGrasse Tyson explains to co-host Eugene Mirman when he answers a fan's Cosmic Query in this StarTalk Radio "Behind the Scenes" video. And if you love StarTalk Radio, don't miss out on any StarTalk news. Sign up for our free newsletter: http://www.startalkradio.net/newsletter/youtube/ Catch up with StarTalk Radio around the web: iTunes - http://bit.ly/SOHDg6 SoundCloud - https://soundcloud.com/startalk Stitcher - http://www.stitcher.com/podcast/startalk Twitter - https://twitter.com/#!/StarTalkRadio Facebook - http://www.facebook.com/StarTalkRadio Google+ - http://googleplus.startalkradio.net Pinterest - http://pinterest.com/startalk/ Tumblr - http://startalkradio.tumblr.com/ Instagram - http://instagram.com/startalkradio