2015: A Great Year for Space Exploration

Our year-end review features the “best of 2015” lists from Jason Davis, Casey Dreier, Emily Lakdawalla and Bill Nye the Science Guy. What’s Up offers planets, a comet, and a nice prize package for the space trivia contest. Links to the contest, online work of this week’s guests and “The Looking Planet” are here: http://www.planetary.org/multimedia/planetary-radio/show/2015/1228-2015_review.html