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+ - Shuttle Launch Clouds Put Tunguska Event as Comet->

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eldavojohn
eldavojohn writes "Space.com brings word of a team using new evidence is suggesting that the mysterious 1908 event in Tunguska was a comet despite a team two years ago arguing it was an asteroid. The comet theory does explain the odd phenomenon of the night skies being lit up for several nights following the event all across Europe--about 3,000 miles away. Researchers believe this points to a comet because when the space shuttles launched today pass through the atmosphere they cause or improve the formation of noctilucent clouds. These clouds are so high up (55 miles) they are only made of ice particles and they are only visible at night which gives researchers reason to draw the conclusion that the 300 metric tons of water vapor that the shuttle pumps into the Earth's thermosphere must likely indicate that the thing that hit was loaded with water or ice. This would make it a comet and not an asteroid. This--of course--raises new upper-atmosphere physics problems for the Tunguska event but explains the strange phenomenon over the skies of the world following it. You may remember analysis of Lake Cheko last year in an effort to better understand what happened."
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Shuttle Launch Clouds Put Tunguska Event as Comet

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