Image: NASA An international exercise to simulate an asteroid striking Earth has come to an end. With just six days to go before a fictitious impact, things don’t look good for a 185-mile-wide region between Prague and Munich. Advertisement Two years ago, the organizers of this event accidentally destroyed New York City, and now it’s time for a border region intersecting Germany, Austria, and Czech Republic to meet the same fate. When I covered the early days of this week’s simulation on Wednesday, the gathered experts were weighing their options as a 460-foot-wide asteroid barreled toward Central Europe.