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[探索发现] 2014-05-11 BBC 地平线:陨石的真相-1

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For the residents of the Russian city of Chelyabinsk,the morning of Friday,February 15,2013.begain like any other.As they set off to work,in what has become a craze throughout Russia,many recorded their journeys.But these cameras,usually used for capturing minor traffic incidents,were about to record history.A Fire ball ,brighter than the sun,appeared from nowhere.Before exploding with the power of 30 Hiroshimas.A minute later,a shackwave blew in the windows of 4000 buildings across the region,the broken glass accounting for most of the 1200 injuryed.The people of Chelyabinsk had just experienced the most powerful metor strike for more than a century.The meter that exploded over Chelyabinsk is a spectacular remiinder of just how exposed our world is .
Earth is this tiny planet in a vast .violent coss.It's also a reminder of the powerful impact that these alien rocks can have on the fate of our planet and on us.
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