Nov 6, 2013 The Chelyabinsk meteor seemed to come out of nowhere, The initial explosion carried an energy equivalent to about 500 kilotonnes.
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Nov 7, 2013 The Chelyabinsk airburst was the largest since Tunguska in 1908, but of Western Ontario, calculated the energy of the Chelyabinsk airbust.
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Nov 6, 2013 The meteor that exploded over Chelyabinsk, Russia in February 2013 from the fact that the energy was deposited over a range of altitudes.