Co-Founder and Executive Director Emeritus, The Planetary Society
The 50th anniversary of the beginning of the space age found Planetary Society Executive Director Louis Friedman in Moscow. We'll talk to Lou about the celebration there, and how the first human made object in orbit changed his life. Emily Lakdawalla explains how we know some rocks reached us from Mars. Bruce Betts and Mat Kaplan are barking at the night sky in What's Up, and they have a new space trivia contest in store.