The Chelyabinsk meteor that exploded over Russia smashed through Earth’s atmosphere on the rebound from a collision with another asteroid in space. Researchers from Tohoku University in Japan have analysed the debris left behind by the space rock, which caused the second largest asteroid airburst in human history, in an effort to help understand how near-Earth objects could end up on a crash course for our home world. The scientists found that the rocks left behind by the Chelyabinsk asteroid contained the high-pressure mineral jadeite, which is only formed under extreme pressure and high temperatures.
http://www.forbes.com/sites/bridaineparnell/2014/05/23/cosmic-collision-sent-chelyabinsk-asteroid-hurtling-towards-earth/
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