Big Rockets and Little LightSails

Digital editor Jason Davis is a lucky guy. He follows and reports on human spaceflight progress, as well as the progress of the LightSail solar sail, which is about a year from its next flight. Emily Lakdawalla shares her thoughts about the Mars depicted in The Martian, while Bill Nye has sharp words for NASA’s new plan for getting humans there. Learn more and enter the What’s Up trivia contest at http://www.planetary.org/multimedia/planetary-radio/show/2015/1012-big-rockets-and-little-lightsails.html