Opportunity Reaches Endurance Crater on Mars

Mars Exploration Rover has reached its latest goal. You'll hear Steve Squyres at a JPL press briefing announcing its arrival, and Phil Christensen of Arizona State will tell us why Endurance Crater looks so promising. Emily Lakdawalla knows how to find a spacecraft sailing out beyond Pluto, and Bruce Betts has a lock on a couple of comets, as well as our latest trivia contest.