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Chelyabinsk meteor had violent history before striking Earth
Chelyabinsk meteor had violent history before striking Earth

Long before the Chelyabinsk asteroid slammed into the atmosphere over Russia last year, it struck another space rock in a high-intensity mash-up that put it on a collision course with Earth, scientists say. A research team from Japan and Russia analyzed fragments of the Chelyabinsk meteorite to glean details about its history. They focused on places in the fragments that contained jadeite, a mineral that forms under high pressure. The jadeite was found in ribbons of mineral called shock-melt veins. These veins are the result of melting that results from high-temperature, high-pressure situations -- such as asteroid-asteroid collisions. The veins ranged in width from roughly the thickness...

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