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June 30, 1908 - Tanguska Explotion In Russia Remains Mysterious
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June 30, 1908 - Tanguska Explotion In Russia Remains Mysterious
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Topic: June 30, 1908 - Tanguska Explotion In Russia Remains Mysterious (Read 404 times)
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Bianca
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Posts: 41646
Re: June 30, 1908 - Tanguska Explotion In Russia Remains Mysterious
«
on:
June 30, 2008, 08:51:17 am »
However ...
At the same time, prior estimates may have overstated the devastation the event caused.
The forest back then was unhealthy, according to foresters, so it would not have taken as much energy to blow down such trees. In addition, the winds from the explosion would naturally get amplified above ridgelines, making the explosion seem more powerful than it actually was. What researchers had thought to be an explosion between 10 and 20 megatons was more likely only 3 to 5 megatons, Boslough said.
As to whether the impact was similar to a stony, carbonaceous asteroid or a comet, "while the community has pretty much accepted the view that it was a carbonaceous asteroid, I'm not sure it's a slam dunk," Boslough said. "The main argument against it being a comet is statistical. There are a lot more small Earth-crossing asteroids than comets at least by a couple orders of magnitude. While it's unlikely to be a comet, I'm not convinced it's physically impossible."
Discovering the size and makeup of whatever hit at Tunguska could shed light on how often such a devastating impact might take place, explained NASA Ames Research Center planetary scientist and astrobiologist David Morrison.
"As interesting though Tunguska is, I'm more interested in the next Tunguska," Morrison told SPACE.com. "We know small objects are far more numerous than large ones out there, so we want to see how much damage they might be able to do."
Death from below?
Instead of a cause from above, in the last decade some researchers have suggested the Tunguska explosion actually came from below. Astrophysicist Wolfgang Kundt at the University of Bonn in Germany and others have suggested that an eruption of natural gas from kimberlite, a kind of volcanic rock best known for sometimes holding diamonds, could be to blame.
"It would have come from the molten earth, some 3,000 kilometers deep (1,864 miles)," Kundt said. "The natural gas would be stored as a fluid that deep, and when it reaches the surface it would become a gas and expand by a factor of thousand in volume, for a huge explosion."
For support, he cited the pattern the trees fell in, as well as chemical anomalies.
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