Tunguska event. Trees were knocked down and burned over hundreds of square km by the Tunguska meteoroid impact. This image is cropped from the original, taken i
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Tunguska event

On 30 June 1908 a blast over Siberia flattened 830 square miles of forest and left no crater.

30 June 1908

A blast this large left no hole. How many others have struck without a trace?

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Photo: Leonid Kulik, the expedition to the Tunguska event, Public domain, Wikimedia Commons

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