The universe is vast, mysterious and desirable. We all know that there are countless galaxies in the universe, and the solar system is just one of them. The earth is a planet of intelligent life in the solar system. Human beings were born on the earth. After millions of years of evolution and growth, today’s human beings have gone further and further on the road of rapid development of science and technology, and have stepped out of the earth to explore the universe.
Many young people like to look up at the starry sky at night to see if there will be traffic, and then make a wish quickly. The beauty of the meteor at that moment fascinates many people, while the meteor shower is even more beautiful. However, the meteor shower is very rare and may not be encountered once in decades. People in ancient times actually knew that these meteors were meteorites from outside the sky.
With the development of science and technology, people are not unfamiliar with meteorites. They also know that they come from small celestial bodies or asteroids in space. But in many people’s understanding, meteorites are burning into the earth, and many people through astronomical telescopes to observe meteorites in space also found that they are in a burning state. So someone raised a question: if there is no oxygen in space, why can meteorites still burn? Today, we’ll listen to how scientists explain this. I believe you will come to a sudden realization after listening to the explanation of scientists.
We must first understand a common sense: the combustion of any material needs to meet two conditions, one is to have combustible materials, the other is to have combustion supporting materials. For most substances on the earth, combustion supporting materials are oxygen. Even if the nuclear fusion happens in the inner part of the sun, it still meets the two conditions of material combustion, otherwise nuclear fusion will not happen.
So what is the combustion supporting material of meteorite in space? In fact, this question itself is wrong. We need to understand a truth: Meteorites in space can’t be burned, and the truth is very simple, because space is a vacuum environment, and there are no combustion supporting materials in it. Neither meteorites nor other celestial bodies can be burned. If so, what is the situation of meteorite burning that we see?
For this problem, we can explain it from two situations: meteorite flying at high speed in space and entering the atmosphere. In the first situation, when a meteorite is still flying in space, it is not called a meteorite. We call it a meteorite because it falls to the ground after passing through the atmosphere. In space, we call it a meteorite or meteorite matrix.
Through astronomical telescopes, we can see that meteorites are in a burning state when flying at high speed in space. Other meteorites are not burning, but the ice crystals on the surface of meteoroids keep evaporating or falling off in the process of flying at high speed, and then gather in the caudal plate under the action of high-speed motion to produce a burning state.
We know that these meteoroids in space basically come from the distant asteroid belt or the Kuiper belt on the edge of the solar system, which is too far away from the sun and is an extremely cold place. Many objects in the asteroid belt or Kuiper belt have ice water. These small objects will take a lot of ice water on their way to the center of the solar system Ice crystals.
With the distance from the sun getting closer and closer, the temperature is also rising, and the speed of the meteor itself is very fast, so the ice crystals on the meteor body will start to melt or fall, and then gather in the tail of the star, it looks like it has a burning tail. The comet is the best embodiment of this spectacular scene. The ancient people called it broomstar, which is a kind of comet It’s an ominous omen.
This is the case of meteoroids burning in space. When meteoroids fall into the atmosphere, their speed will be faster and faster. At this time, they will have huge friction with the atmosphere, generate heat by friction, generate enough heat, and then burn under the use of combustion supporting gas. After a meteoroid falls into the earth’s atmosphere, the combustion supporting gas is mainly oxygen. If it falls into other planets with atmosphere, the combustion supporting gas is not necessarily oxygen, but also other gases.
The combustion of meteoroid after falling into the atmosphere is the real combustion, and it is precisely because of its combustion that it can burn out or become very small before hitting the ground, so that it will not cause great damage to the ground. If there is no atmospheric barrier, like the moon, meteoroids will directly hit the surface of the planet, resulting in huge destructive force.
The reason why the earth can give birth to life has a lot to do with its thick atmosphere. If the earth does not have an atmosphere, there will be no birth of life. Even if life is born, it will be extinct again and again under the impact of meteorites. In fact, in the 4.6 billion years since the birth of the earth, there have been five mass extinctions. The last one was the extinction of dinosaurs 65 million years ago, which was caused by an asteroid hitting the earth.
I believe that after reading the above explanation, friends should understand why meteorites can burn in space. In fact, it’s not burning, it’s just a burning state. Although many friends like to see the division of meteors in the night sky, but we still hope that the earth’s night sky less meteors across, that is a beautiful danger. Most meteoroids will be burned up after entering the earth’s atmosphere, which will not cause impact risk to the earth. However, if they encounter larger asteroids or metal meteorites with special materials, the atmosphere may not be able to burn them up, and then impact the surface to produce huge destructive force.
In the seemingly calm environment of the solar system, there are actually many asteroids. There are no less than 100000 asteroids in the asteroid belt between Mars and Jupiter, while there are an incalculable number of asteroids in the Kuiper belt on the edge of the solar system. Once any one of these asteroids is out of orbit, it may pose a threat to the earth.
So now scientists are also actively exploring technologies and methods to defend or destroy asteroids. Only when human beings have the technology and ability to defend against asteroid impact, can the earth really have no worries. Otherwise, once another asteroid like 65 million years ago collides directly with the earth, we will have no way to defend it. We can only watch it collide with the earth, and then go back to earth Welcome the sixth mass extinction of the earth.
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