Ad Astra Builds "The Martian's" Rocket Engine

Mat Kaplan visits the Ad Astra Rocket Company in Texas where they are perfecting the VASIMIR electric rocket engine. Emily Lakdawalla has created a comprehensive timeline tracing missions throughout the solar system. Bill Nye salutes Planetary Society colleagues who gathered to record a Planetary Radio Extra year in review conversation. The new year’s sky is chock full of planets according to Bruce Betts. An Ad Astra audio tour and photos are here: http://www.planetary.org/multimedia/planetary-radio/show/2016/0104-2016_review.html