Neil deGrasse Tyson on Calculating the Distance of a Quasar

If a quasar is billions of light years away, how can we calculate that distance when the light takes billions of years to reach us? Astrophysicist Neil deGrasse Tyson explains why we can see events that took place before Earth even existed in this StarTalk Radio "Behind the Scenes" Cosmic Queries video with comic co-host Eugene Mirman. 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