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Today more than 1000 people were injured when a meteoroid exploded over Chelyabinsk in central Russia. About 40,000 tons of space rock fall to earth each year, but rocks of this size land on average only once a decade. And Asteroid 2012 DA14 passed within 17,100 miles of earth this afternoon, the closest miss on record. With Newark Mayor Cory Booker preparing to run for the U.S. Senate, who will protect us from falling space rocks?