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Related: Editorials & Other Articles, Issue Forums, Alliance Forums, Region ForumsMystery solved: meteorite caused Tunguska devastation
On the morning of June 30, 1908, a gigantic fireball devastated hundreds of square kilometers of uninhabited Siberian forest around the Tunguska River. The first scientists to investigate the impact site expected to find a meteorite, but they found nothing. Because no traces of a meteorite were found, many scientists concluded that the culprit was a comet. Comets, which are essentially muddy ice balls, could cause such a devastation and leave no trace.
But now, 105 years later, scientists have revealed that the Tunguska devastation was indeed caused by a meteorite. A group of Ukrainian, German, and American scientists have identified its microscopic remains. Why it took them so many years makes for a fascinating tale about the limits of science and how we are pushing them.
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Victor Kvasnytsya from the National Academy of Sciences of Ukraine and his colleagues used the latest imaging and spectroscopy techniques to identify aggregates of carbon mineralsdiamond, lonsdaleite, and graphite. Lonsdaleite in particular is known to form when carbon-rich material is suddenly exposed to a shock wave created by an explosion, such as that of a meteorite hitting Earth. The lonsdaleite fragments contain even smaller inclusions of iron sulphides and iron-nickel alloys, troilite and taenite, which are characteristic minerals found in space-based objects such as meteorites. The precise combination of minerals in these fragments point to a meteorite source. It is near-identical to similar minerals found in an Arizona impact.
The samples point to one thing: the Tunguska impact is the largest meteorite impact in recorded history. US researchers have estimated that the Tunguska blast could have been as much as the equivalent of a five megaton TNT explosionhundreds of times more powerful than the Hiroshima blast. The meteorite tore apart as it entered the atmosphere at an angle, so that little of it reached the ground intact. That is why all that remains are such small specks that have been fossilised in the Siberian peat.
http://arstechnica.com/science/2013/6/mystery-solved-meteorite-caused-tunguska-devastation/
lordsummerisle
(4,651 posts)Last edited Mon Jul 1, 2013, 09:38 PM - Edit history (1)
I thought it was established a few decades ago. There was some disagreement for a while about whether it was a comet or asteroid but the asteroid argument won out, as I remember it...
zappaman
(20,606 posts)You think it is a coincidence that this comes out AND Snowden is in Moscow?
Something is going on here and I think it stinks!
indepat
(20,899 posts)meteorite is estimated as only 1/10 as powerful as the Russians' nuke..