What’s playing on the radio near Arcturus tonight? Tune in as Neil deGrasse Tyson, host of StarTalk Radio, and Carter Emmart, Director of Astrovisualization at the Hayden Planetarium, discuss how far human radio waves have traveled into space since their invention. If you like this track, be sure to check out the full StarTalk Radio episode “Let There Be Light” at http://www.startalkradio.net/show/let-there-be-light/.