Visit the descent of the desert along the border of Libya and Egypt, and you could stumble upon pieces of pale yellow glass, traces the impact of the meteor which happened 29 million years ago.
That cup, of which a significant piece was used in jewelery The Tomb of King Tuta, long claimed to have celestial roots. It is also a topic of a new study that reveals that the so-called Libyan glass of the desert was probably caused by a meteorite influence rather than the air in the space rock. If research is maintained, it suggests that scientists are studying the threat of asteroid collision with Earth they may not have to worry so much about the consequences of large rock rock exploding in the atmosphere.
"And meteorite impacts and airborne outbreaks can cause melting," lead author Aaron Cavosie, a geologist from Curtin University, Australia, according to a statement, "However, only meteoric influences create shock waves that form high pressure minerals, so finding evidence of the former reid confirms that it was the result of the impact of meteorites."
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They knew that a large glass rock hit the ground or not. But Cavosie and his co-author wanted to find out whether the culprit was an impact or air strike. So they worked with seven pieces of pale yellow glass, looking at them under a powerful scanning microscope. This enabled the pair to look close zircon crystals within the glass, which develop a little different structure depending on what is happening to them during the millennium.
This analysis has shown that some of the zirconium crystals were once grunts, a mineral that is formed only under very specific high pressure conditions that matched with what happens when a meteor falls to the Earth, but not when such a space rock explodes in the air. (In the e-mail for Space.com, Cavosie added that although scientists did not notice crater to respond to the impact, there is a lot of sand in the area that could hide such a structure beneath the dunes.)
Cavosie and his co-author hope to have this comforting news for planetary defense specialists focusing on the threat of asteroid collision with Earth and what people can do to protect them. That's because after Airburst above Chelyabinsk, Russia, 2013People worried that the Libyan glass of the desert was created during much, much larger air strikes.
Now, geologists say that with that reidit identified in Libyan desert glass, that scenario outside the table. Combine it with the fact that geologists have found no evidence of relatively recent glass samples that do not appear, and the findings suggest that even massive air mud had no such serious consequences on earth as some people feared.
The study is described in paper published May 2 in Geology.