Visit the right stretch of the desert along the Libyan border and Egypt, and you could come across pieces of pale yellow glass, a trace of a meteorite that happened 29 million years ago. This glass, a remarkable piece of which was used in jewelery found in the tomb of King Tutt has long been claimed to have celestial roots. This is also the subject of a new study that finds that the so-called Libyan desert glass is probably created by a meteorite impact rather than a cosmic rock explosion. If the study holds, it suggests that scientists studying the threat of collisions of asteroids with the Earth may not have to worry so much about the consequences of the place of large cosmic rocks exploding into the atmosphere.
Both meteorite impacts and airborne explosions can cause melting, "says lead author Aaron Kavossi, a geologist at the University of Curtin in Australia, . "However, only meteor hits create shock waves that form high-pressure minerals, so finding evidence of the former raid confirms that it was created as a result of a meteor impact." Even if we can stop a dangerous asteroid, you can mean that we can not achieve success
They knew that whether the cosmic stone on the glass walls hit the ground or not, it was great . But Kawasaki and his co-author wanted to find out whether the culprit was an impact or an explosion. So they worked with seven pieces of pale yellow glass looking at them under a powerful scanning microscope. This allows the couple to have a close look at zircon crystal in the glass, which develop slightly different structures depending on what has happened to them over the millennia.
This analysis suggests that some of the crystals of the zircon have once been a reidite, a mineral formed only under very specific high pressure conditions that coincide with what happens when the meteorite is thrown into the Earth but not when such rock space explodes in the air. (In email to Space.com, Cavosie added that although the scientists did not notice the crater to match the impact, there is a lot of sand in the area that might hide such a structure beneath the dunes
Cavosie and his co-author hope that this is a comforting news for planetary defense experts who focus on the threat of crash of asteroids with the Earth and what people can do to protect themselves, because after the aircraft blast over Chelyabinsk, Russia, in 201
The study is described in Document published on May 2 in the journal Geology.