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SCIENCE
NEW THEORY ON TUNGUSKA EXPLOSION
JUNE 26 2009
The mysterious Tunguska explosion in 1908 leveled hundreds of square miles of Siberian forest, leaving trees flattened to the ground. New evidence, based on strange, glowing clouds in the upper atmosphere, proves that Tunguska wasn't caused by aliens after all.
This week in Geophysical Research Letters, a group of scientists propose that the space shuttle's cloudy wake gives us a hint about what kind of object could have caused the Tunguska explosion. The space shuttle leaves high, icy clouds in the upper atmosphere called noctilucent clouds. Because these clouds contain so much ice, they often glow (see image) with reflected light from the ice particles.
Eyewitness accounts of the Tunguska explosion include reports of glowing clouds in the sky afterwards. Scientists speculate that these were noctilucent clouds left behind by an icy comet as it entered the atmosphere.
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