“The meteor that exploded over the Ural Mountains in Russia Friday now appears to have been a small asteroid clearly unrelated to 2012 DA14, which flitted past Earth Friday afternoon.  Researchers now say the object had a mass of 7,000 metric tons (7,700 US tons) and a diameter of about 50 feet.  The asteroid’s breakup at an altitude some 12 to 15 miles above Russia’s Chelyabinsk region represents the largest recorded asteroid encounter since 1908, when another asteroid or comet exploded over the Tunguska River in Siberia, leveling some 820 square miles of forest.”

http://www.csmonitor.com/layout/set/print/Science/2013/0215/Russian-meteor-blast-had-force-of-300-kiloton-nuclear-warhead-video

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