Astonishing Mercury, With MESSENGER Principal Investigator Sean Solomon

When the MESSENGER spacecraft flew by Mercury in January, it gave us the first up close look in nearly thirty-three years. PI Sean Solomon returns to tell us about the amazing data gathered during the encounter. Bill Nye loves Pluto's new classification. Emily Lakdawalla follows the odyssey of Mars Odyssey, and Bruce Betts checks in from NASA/Ames as he checks on the night sky with Mat Kaplan, and gives away a WALL*E video game. New space trivia contest, too!