Dawn mission chief engineer Marc Rayman returns to Planetary Radio with an update on this amazing mission to the solar system's two largest asteroids. Emily previews Rosetta's encounter with yet another big space rock. Bill Nye the Planetary Guy salutes the IKAROS solar sail, now fully-deployed. Bruce Betts and Mat Kaplan might help you buy your own space shuttle if you tell them why you want it. That's the new What's Up? contest.