First ever evidence of a comet striking Earth

From Phys.org
http://phys.org/news/2013-10-evidence-comet-earth.html#!
Based on the publication:
“Unique chemistry of a diamond-bearing pebble from the Libyan Desert Glass strewnfield, SW Egypt: Evidence for a shocked comet fragment”
By Jan D. Kramersa, Marco A.G. Andreolib, Maria Atanasovad, Georgy A. Belyanina, David L. Blocke, Chris Franklynb, Chris Harrisf, Mpho Lekgoathib, Charles S. Montrossg, Tshepo Ntsoaneb, Vittoria Pischeddah, Patience Segonyaneb, K.S. (Fanus) Viljoena, Johan E. Westraadtg

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One thought on “First ever evidence of a comet striking Earth

  1. This material does not match any other known samples of cometary debris, which do exist in the form of dusts recovered in ice cores, oceanic sediments, and in the upper atmosphere, in addition to to actual successful attempts, such as the Stardust mission, to retrieve samples directly. Therefore, it is impossible to confirm of “prove” that a comet not only impacted over Egypt, but also produced just this single pebble, and still not resemble ACTUAL cometary material. I call bullshit. There are terrestrial objects that HAVE been studied that match the isotopic profiles of Hypatia better than any of the meteoritic proxies. In fact, much of the findings of the South African team were suggestive of terrestrial origin – where isootopic markers were identical to the sediments the pebble was found upon. What’s the response? “It’s terrestrialized’ it absorbed terrestrial gasses upon entry and impact.” This is only supported by an assumption that Libyan Desert Glass is of a very advanced age, and, by association, the pebble became ancient, and “extraordinarily” well-preserved. Since many unusual, abundant fulguritic glasses – created by lightning – have been found in the area, in addition to the almost certainly impact-created Libyan Desert Glass, it strikes me as odd that the fulgurite hypothesis was rejected for the origin of Hypatia. Diamonds are NOT special, and most fulgurites actually take more heat to be produced than that hypothesized for the formation of Libyan Desert Glass and other tektite forms.

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