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Provides background and analysis for a paper that attempts to explain what happened to the fragment of the object that exploded over Tunguska, Siberia in 1908. The paper by V.V. Svetsov found in the October 24, 1996 issue of `Nature'; The history of scientific research of the Tunguska explosion; The controversy between those who believe the object was a comet and those who believe it was an asteroid.