As we all know, it is believed that the most likely cause of dinosaur extinction is the asteroid impact on the earth, so we can see how powerful the meteorite fall is. In July last year, an asteroid called “2019 OK” nearly hit the earth. The diameter of the asteroid is 130 meters. When it was closest to the earth, it was about 72000 kilometers, and the speed was 24 kilometers per second, which was very fast.
Scientists have estimated its destructive power according to its speed and size. If it falls into the earth, although it will not destroy the earth, it is possible to destroy several cities or even a country. And the terrible thing is that no one found this asteroid before they got close to the earth.
What’s the probability of a meteorite hitting the earth? In fact, space meteorites are fragments of the formation of the solar system, ranging from a few millimeters to thousands of kilometers. Most of the meteorites are concentrated in the asteroid belt between Mars and Jupiter. There are many celestial bodies in the asteroid belt, which are easy to collide with each other. Once they collide, they will change their original direction, and they are likely to fly to the earth.
Astronomers speculate that about 100 tons of debris will fly into the earth’s atmosphere every day, but because most of them are too small, the atmosphere can easily “solve”. At present, there are about 18000 known asteroids in the universe that may collide with the earth, and these asteroids are larger and orbit fixed with a diameter of at least 1km.
At present, scientists calculate that 90% of the asteroids in orbit may not hit the earth in the next 100 years, but don’t be too happy, because we don’t know about 10% of them, and this 10% may be enough to destroy the earth. What’s more, there are millions of asteroids less than 100 meters in diameter, which are very terrible.
At present, 190 craters have been found on the earth, the largest of which is the friedburg crater in South Africa, with a diameter of 300 kilometers. It is presumed that it was smashed out by a meteorite about 15 kilometers in diameter two billion years ago. It’s a billion times more powerful than Hiroshima.
Therefore, if human beings are extinct, the main reason may be the impact of cosmic meteorites. So what’s the human response to the meteorite that hit the earth?
In fact, NASA has proposed three solutions to this problem
1、 Use weapons to destroy it
Weapons mainly consider missiles, or missiles plus nuclear bombs, so that they can chase meteorites from the side. However, meteorites are falling too fast, reaching tens of kilometers per second. The speed of missiles may not be half that of meteorites, so it is difficult to catch up. Even if there is a chance to catch up with the meteorite and smash it, however, the smashed meteorite is still very powerful, and its damage scope may also be expanded, and the debris will fall everywhere.
2、 Changing the orbit of meteorites
If we can make it in time, we’d better change its orbit in the universe so that it doesn’t have a chance to get close to the earth. How can it be changed? It’s to use an object with a very large mass to lead it away. If there is no way to change its orbit in time in the universe, it should also change its falling orbit in time after it enters the atmosphere, so that it can descend to a place where there is no one, such as the sea or the South Pole.
3、 Early evacuation
If scientists can calculate the time and place of the meteorite’s landing in advance, they can evacuate the people in that place, evacuate them to other safe cities, or move them underground.
Xiao Bian believes that from the three plans proposed by NASA, it is still very difficult to solve the problem of asteroid impact on the earth. If there is a real disaster, maybe our fate will be like a dinosaur.
What do you think of this? Welcome to comment area.