The Most Earthlike Extrasolar Planet Yet -- A Conversation With Co-Discoverer Stephane Udry

Gliese 581c is just a bit bigger than Earth and orbits in the so-called habitable zone, where water could be liquid on its surface. You'll hear from Stephane Udry of the Geneva Observatory, one of the leaders of the international team that discovered it. Emily Lakdawalla goes stargazing on Mars, and Bruce Betts muses on the night sky, magnets, and ducks in this week's What's Up and announces the new space trivia contest.