2020-07-13

800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

By yqqlm yqqlm

When we look up at the starry sky, the twinkling starlight will surprise people. If the planet is the protagonist of this picture, then asteroids and meteorites are embellishments. They do not emit light, but they are also part of the cosmic celestial system. But let’s be honest, if these meteorites and asteroids are”securely keeping their own lives,” we can still look at it with appreciation. When they are restless, we will feel threatened, deadly threatened.

getInterUrl?uicrIvZQ=1d207ed1f408175c4e8da382bde0a847 - 800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

Meteor craters on earth are evidence. According to incomplete statistics, the number of large craters has exceeded 120, even Antarctica. There is a crater over 300 kilometers in diameter. Satellite pictures from previous years show that there is also a crater with a diameter of more than 1,000 kilometers in the central area of ​​the Atlantic Ocean. Every time a meteorite strikes, there will be a group of lives dead. So from this perspective, the meteorite is our enemy, it will threaten our lives.

Some scientists specialize in studying craters, and they conduct investigations around the world. It seems to us to be a pit, but to them it is a relic of geological history. And while they were chasing craters everywhere, they discovered a strange thing.

getInterUrl?uicrIvZQ=1f114ee227a315bcc1489fbbc2df05be - 800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

There is enough evidence that a meteorite with a diameter of more than 1 km hit the earth 800,000 years ago, but scientists I couldn’t find where the crater was, so I could only hold a few broken meteorites and meditate.

The formation of craters

Let’s first talk about the process of meteorite impact, the speed of large meteorites is basically more than 10 kilometers per second, and the duration of the impact process will not exceed 1 second. In just 1 second, all the energy carried by the meteorite will be released, and the shock wave will enter the surface. At the same time, the surrounding area will be melted due to the terrible high temperature. Substances with thin components will not be melted, but will be vaporized directly.

getInterUrl?uicrIvZQ=772121c629e80a7329e5710560e0a35e - 800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

The pressure conservatively estimated by the shock wave is also one million times the atmospheric pressure. After the molten material is impacted, it will splash around. The area where they are scattered is the scattering area where the meteorite impacted. In general, the size of the crater is 20 times the diameter of the meteorite, and the depth is determined by the size of the shock wave and the speed of the meteorite. As for the extent of the distribution area, it depends on the position of the molten material, and there are some large and small.

Most of these molten materials are black stones. There are more than one million black stones in the famous Australian distribution area, and some black stones are glass-like. The area of ​​the Australian distribution area includes Indian Peninsula, Oceania and parts of the Indian Ocean. It is precisely because the distribution area is too large, scientists have never Find the exact location of the crater.

getInterUrl?uicrIvZQ=8cab4737a9b0d662e6c9c6d3359b3575 - 800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

Only preliminary judgment in Southeast Asia, they began a difficult exploration process, and spent a lot of money borrowing gravity detection technology. Finally, at the end of last year, I found the approximate range of the crater, just in the Lao Pulain Plateau region of Laos. This place has a high average altitude and there is a lava bed underground. There are obvious traces of meteorite impact inside the lava bed.

getInterUrl?uicrIvZQ=037935aa5f7292bc3207cd7f2a6f5529 - 800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

The answer is solved, the crater is here, and the diameter is about 20 kilometers. The reason why it has not been found has also been solved. There is a dormant volcano in this place, and a large-scale eruption has occurred. When a volcano erupts, high-temperature lava material will cover the ground, forming a thick lava bed. Although the crater was large, it was buried by lava material.

As mentioned earlier, the size of the crater is generally 20 times the diameter of the meteorite. This meteorite that struck the earth 800,000 years ago has a diameter of about 1.9 kilometers. After investigating the location of the crater, scientists established a mathematical model to estimate the explosion range at that time, and the result was 400 kilometers.

getInterUrl?uicrIvZQ=0f0eb0b191a3dd85a408fd2188e05f42 - 800,000 years ago, a meteorite hit the earth, but the location of the crater was not found until last year

This means that the animals and plants covered by the explosion area have suffered the topping disaster. Perhaps the volcanic eruption was when the shock wave broke through the formation, Only then awakened the volcano, which was a chain reaction. It is worth mentioning that the gravity detection technology has unexpected effects when searching for craters. At present, it has been regarded as a treasure by scientists, and it is expected to find craters in the future.