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On the morning of June 30, 1908, the largest cosmic air explosion in history occurred in the Podkamennaya Tunguska River basin of Siberia. The event felled and burned an estimated 80 million trees over an area of approximately 2,150 square kilometers. The energy released from the explosion is estimated at 10–15 megatons of TNT equivalent, approximately a thousand times the power of the atomic bomb dropped on Hiroshima in 1945. One of the most striking features of the event is that it did not lea