2 billion years ago, an asteroid 25 km in diameter crashed into Earth, creating a 280 km wide crater and affecting the global climate.
The largest asteroid ever hit Earth has been created The giant Vredefort impact crater, near Johannesburg, South Africaabout 2 billion years ago, when the Earth was only inhabited by single-celled organisms and trees did not yet exist.
Vredefort impact crater
Although largely eroded, Vredefort Crater still shows the giant impact of the asteroid collision 2 billion years ago. (Photo: NASA Earth Observatory/Lauren Dauphin/US Geological Survey)
With the estimated size of the impact crater immediately after the collision being 250 to 280 km, scientists initially thought the asteroid was about 15 km in diameter. However, research from the University of Rochester shows that: The diameter of this asteroid can reach 25 km, Science IFL reported September 29. New research published in the journal Journal of Geophysical Research: Planets.
Used by a research group iSALE physical program and calculate the size of the asteroid needed to create an impact crater as large as Vredefort. They found that the initially estimated diameter would only create an impact crater about 172 km wide. To reach 250 to 280 km, the asteroid must be much larger.
Experts can estimate the impact asteroid Vredefort will have on Earth’s environment based on the Chicxulub impact. A 10 km long asteroid crashed into Earth, creating the Chicxulub crater, wiping out 75% of Earth’s plant and animal species, including dinosaurs, around 66 million years ago.
2 billion years ago, there weren’t many living things. However, scientists believe that although it did not cause a mass extinction like the Chicxulub one, the Vredefort collision had a greater impact on the global climate.
The large amount of dust disrupted by the collision could obscure the Sun for hours or even decades. Class “Solar cream” This will cause a significant decrease in the Earth’s surface temperature. When the dust settles, the CO2 emitted by the collision will increase the temperature of the blue planet by several degrees.
Such large collisions during this period help scientists better understand the geography of Earth 2 billion years ago. Additionally, the information collected also helps them study the effects of other large planetary collisions and estimate the effects of future collisions.
Article source: VnExpress
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About 2 billion years ago, an asteroid with a diameter of 25 km crashed into Earth, creating a crater about 280 km wide and affecting the global climate. Little…