Deep Impact's Principal Investigator, University of Maryland
The launch of the Deep Impact spacecraft this week begins a mission that will end on the 4th of July with the spectacular creation of a crater on a comet. The mission's Principal Investigator, Mike A'Hearn, is our guest. Emily Lakdawalla knows there is something other than an earthquake that can generate a tsunami. Space headlines, and Bruce Betts offers a new space trivia contest on What's Up.