Photo: Tunguksa Blast Mystery Solved by Space Shuttle?



Trees lay strewn across the Siberian countryside in 1953, 45 years after a mysterious explosion rocked the Tunguska region with the force of several hundred atomic bombs.

Based on rare clouds that can form from the plumes of space shuttle launches, June 2009 research suggests that the Tunguska event was most likely caused by an icy comet exploding in midair.

File photograph from AP


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