430,000 years ago, a huge meteorite exploded over Antarctica without leaving a crater. This object is similar to the one that caused the Tunguska disaster.
The Tunguska car was a big explosion that occurred near the Tunguska River in Podkamonaya, Russia on the morning of June 30, 1908. For a long time, it was impossible to explain the reasons for this situation.
Tunguska’s explosive energy is believed to be 185 times stronger than the Hiroshima bomb.
The explosion in the coniferous forest of Siberia flattened about 80 million trees in a forest area of 2,150 square kilometers. At least three people died in the incident. In order to understand the severity of the disaster, the explosion energy is believed to be 185 times stronger than the Hiroshima bomb.
Although it did not leave a crater, it is still classified as an impact event
Even if an impact crater is never found, it is classified as an impact event. It is believed that the object disintegrated at a height of 5 to 10 kilometers without hitting the surface of the earth.
In 2019, the National Aeronautics and Space Administration (NASA) reported that a meteorite explosion in the Earth’s atmosphere was ten times more powerful than the atomic bomb that was dropped on Hiroshima (Japan) in 1945.
The explosion detected by US military satellites occurred over the Bering Sea near the Kamchatka Peninsula in a remote area of Russia.
According to NASA, the explosion is the second largest of its kind in the past 30 years, and the largest meteorite that has reached the Earth’s atmosphere since it hit Chelyabinsk (Russia) in 2013. 1,500 people were injured.
So they found his trace
The newly detected meteors also did not affect the earth. However, it is estimated that the diameter may be between 100 and 150 meters.
The particles unearthed in the mountains of Antarctica were produced by an unusual event. About 430,000 years ago, a meteorite exploded in the air, releasing a stream of molten and vaporized material whose density was not high enough to form an impact crater. According to research published in the Journal of Geophysics, science.
These findings may help scientists better identify “explosive” meteorite impacts on the Earth and prepare for future impacts. When they occur over Antarctica, they are harmless to humans, but if they occur in densely populated places, they may cause serious damage.
It is estimated that the large-scale aerial explosions that occur when asteroids enter the Earth’s atmosphere and explode in mid-air are much more frequent than the impact of meteorites that form craters.
Why does a meteorite explode before it reaches the earth?
However, because it is difficult to identify and characterize the distant fragments in the exploded meteorite, large-scale aerial explosions are mainly identified through witnesses rather than evidence from geological records.
In order to solve the problems of ancient meteorite events that may have occurred in Antarctica with very few or no traces, Matthias Van Ginneken and his colleagues used microscope and laser technology to analyze 17 black species collected at Queen Sol Ronda Mountain (Wønfjellet). And spherical igneous particles Maud Land, Antarctica.
They determined that most particles with a particle size between 100 and 300 microns are mainly composed of olivine and spinel minerals and are welded together with a small amount of glass.
The chemical properties of these particles (including high nickel content) indicate that they originated in outer space.
The researchers also compared these particles with previously identified particles found in EPICA Dome C and Dome Fuji ice cores. EPICA Dome C and Dome Fuji ice cores recorded weather events in Antarctica 430,000 and 480,000 years ago, and pointed out The similarities indicate that these particles are the result of a single impact. Asteroids about 430,000 years ago.
Through numerical simulation, combined with the low oxygen 18 isotope content observed in the particles, and the lack of craters associated with the event, Ginneken et al. The conclusion reached was that the particles reached the ice cap through the projectile vapor jets released by the exploded meteorite, which was about 100 to 150 meters in diameter.
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