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Cosmic collision created the Chelyabinsk meteor

from NewScientist

The meteor that exploded over Chelyabinsk, Russia, last year was probably spat out during a collision between two much larger rocks more than 290 million years ago, according to new analysis of the meteor's composition. The meteor is thought to have been about 20 meters wide before it blew up in the atmosphere. Collectors and researchers have recovered a number of fragments in Chelyabinsk, allowing geologists to learn more about its origins. more

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