Is Earth ready for a potentially catastrophic asteroid impact? Unfortunately, the answer appears to be no. An international exercise to simulate an asteroid striking Earth is finished, and with its fictitious impact concluded, things aren't looking so hot for the 185-mile stretch between Prague and Munich. It sounds like a game, but it's actually serious business. The exercise is being led by NASA's Jet Propulsion Laboratory's Center for Near Earth Object Studies and is meant to prepare sc...