Photo 14 Aug Tunguska Event: Mysterious explosion over Siberia in 1908.
http://science.nasa.gov/science-news/science-at-nasa/2008/30jun_tunguska/

Tunguska Event: Mysterious explosion over Siberia in 1908.

http://science.nasa.gov/science-news/science-at-nasa/2008/30jun_tunguska/

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    Tunguska Event: Mysterious explosion over Siberia in 1908.
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