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This photo provided by The Field Museum in Chicago, taken April 9, 2013, shows pieces of a meteor that exploded over Russia's Ural Mountains in February after they were catalogued on their arrival at the Chicago museum. The museum received nearly two pounds of small meteorite pieces donated by a collector. After a surprise meteor hit Earth at 42,000 mph and exploded over a Russian city in February, smashing windows and causing minor injuries, scientists studying the aftermath say the threat of space rocks hurtling toward our planet is bigger than they had thought. Meteors like the one that exploded over Chelyabinsk _ and those that are even bigger and more dangerous _ are probably four to five times more likely to hit Earth than scientists thought before the February mid-air explosion, according to three studies released Wednesday in the journals Nature and Science. (AP Photo/Courtesy of The Field Museum, Karen Bean, File)