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Tunguska Event
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Tunguska Event

Explosion at Tunguska, central Siberia, Russia, in June 1908, which devastated around 6,500 sq km/2,500 sq mi of forest. It is thought to have been caused by either a cometary nucleus or a fragment of Encke's Comet about 200 m/660 ft across, or possibly an asteroid – a bright falling object was seen from 600 km/375 mi away. The explosion was equivalent to a hydrogen bomb (10–20 megatons) and produced a colossal shock wave; it was heard up to 1,000 km/625 away.
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