Saturday , July 24 2021

430,000 years ago, there was a low-altitude meteorite hitting the Antarctic ice sheet and the potential destructiveness worried scientists-Scientific Exploration-cnBeta.COM



An international research team of space scientists led by Dr. Matthias Van Sineken of the University of Kent School of Physical Sciences,New evidence found that low-altitude meteorites hit the Antarctic ice sheet 430,000 years ago. It is speculated that these asteroid meteorites are at least 100 meters in diameter and have fallen at the top speed of the East Antarctic ice cap.

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Credit: Mark A. Garlick

This type of explosion caused by a single asteroid impact is described as a moderate explosion, because it is larger than an aerial explosion, but smaller than an impact crater event.

The spheroids in the fragments, the chemistry of the trace elements and the high nickel content testify to the extraterrestrial nature of the recovered particles. Their unique characteristics of oxygen isotopes indicate that they interacted with the oxygen in the Antarctic ice sheet when they formed in the impact pen.

The results of the study show that the impact of this collision is much more dangerous than the Tunguska and Chelyabinsk events that occurred in 1908 and 2013, respectively.

The research, published in the journal Science Advances, led to an important discovery in the geological record, because evidence of such events is very scarce. In the past, impact particles were often difficult to identify and characterize.

This study emphasizes the importance of reassessing the threat of medium-sized asteroids, because similar landing events can produce similar particles. Such an event will cause complete damage to a large area, which is equivalent to the area where the thermal ray interacts with the ground.

Researchers suggest that future research may focus on identifying similar events in different targets, such as shallow marine rocks or basements, because the Antarctic ice sheet only covers 9% of the earth’s surface. Research can also be used to identify the deposition process of these events in deep-water sediment nuclei.

“While the impact event of the landing may not threaten human activities if it occurs over Antarctica, if it occurs in a densely populated area, it will cause millions of casualties and cause severe damage hundreds of miles away.” .

Translation / Prospective Economist application information group

Link to the document: https://advances.sciencemag.org/content/7/14/eabc1008


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