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Peter Jenniskens

Scientists say the risk of a meteor strike is seven times greater than they believed before the Chelyabinsk strike in February. (OLEG KARGOPOLOV/AFP/Getty Images)

Russian Fireball Shows Risk Of Meteor Strike Bigger Than Believed

Scientists studying the terrifying meteor that exploded without warning over a Russian city last winter say the threat of space rocks smashing into Earth is bigger than they thought.



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