Principal Investigator for MESSENGER, Columbia University
MESSENGER Principal Investigator Sean Solomon returns with an exclusive report on the spacecraft's very successful second flyby of Mercury. Bill Nye has news about a distinguished new President for the Planetary Society. Emily Lakdawallla explains the differences between the orbiters circling Mars. Bruce Betts tells us about the night sky as he gets a preview of our great sixth anniversary contest prizes in What's Up! And we're now giving away a one-year membership in the Planetary Society along with the Planetary Radio t-shirt in the weekly space trivia contest!