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The main reason why we rarely find meteorites is because meteorites are completely burned up when they pass through the atmosphere, so we rarely find meteorites.
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Because most of the meteorites are burned down into very small particles when they pass through the atmosphere at great speed, it is difficult for people to find them.
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No. A meteor is not the same thing as a sparkling star in the night sky.
The stars in the night sky, with the exception of a few planets, are stars in the Milky Way, and like the Sun, they are huge glowing gas planets. We look at them small because they are so far away from us.
In the solar system, there are many very small solid particles, some of which are produced by the collision and friction of asteroids, and more of which are tiny solids that evaporate when the comet approaches the sun, causing the comet to disintegrate and fall off. These small solids are called "meteoroids".
These small particles wander around the solar system, and if they fall to the earth due to the gravitational pull of the earth, when they rub against the earth's atmosphere, the temperature will rise to thousands of degrees, and they will burn and glow, and they will look as bright as the stars in the sky, and like a flash of light across the sky. But their weight is too small, the small ones are only a few grams, and the large ones are only a few tens of kilograms, so they will burn out all at once, and they can only emit a light of different lengths. If it's a larger one, it doesn't burn up completely, and it falls to the ground, it's a meteorite.
Sometimes, larger objects also fall to the earth. But instead of meteoroids, small celestial bodies with fixed orbits that also revolve around the sun are called asteroids.
Meteors refer to the traces of light produced by the gravitational attraction of meteoroids orbiting in interstellar space (usually including space materials such as cosmic dust and solid blocks) when they approach the Earth, and when they pass through the Earth's atmosphere at high speed.
Most meteoroids are depleted before they fall to the ground, and a small number fall to the ground, called meteorites. Most visible meteoroids are about the size of a grain of sand and weigh less than 1 gram. Meteoroids enter the atmosphere at speeds between 11 km s and 72 km s, and the color of each meteor varies depending on how hot it is.
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A meteor shower is a special celestial phenomenon in which a swarm of meteors appears to come in and fall from a point in the sky. This point, or a small area of the sky, is called the radiant of the meteor shower. A radiant is a perspective effect.
The root cause of the formation of meteor showers is due to the fragmentation of comets. Comets are mostly made up of ice and dust. As the comet moves closer to the Sun, the ice vaporizes, causing dust particles to be ejected out of the parent body and into the comet's orbit like fountain water.
However, large particles remain around the parent comet to form dust comets; The small particles are blown away by the radiation pressure of the sun, forming a comet tail. The remaining material continues to remain in the vicinity of the comet's orbit. However, even small eruption velocities can cause very different periods of particle rotation.
Thus, on the next comet return, the small particles will lag behind the parent body, while the large particles will be ahead of the parent body. As the Earth passes through the dust tail orbit, we have a chance to see a meteor shower.
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What is a meteor? Meteors are traces of light produced by the friction and combustion of dust particles and solid blocks (meteoroids) in interplanetary space into the Earth's atmosphere. If they are not burned up in the atmosphere, they are called "meteorites" or "meteorites" when they fall to the ground.
Meteoroids originally orbited the sun, and when they passed near the earth, they were affected by the gravitational pull of the earth and changed their orbit, thus entering the earth's atmosphere. There are several types of meteors: single meteors, fire meteors, and meteor showers. There is no law on the time and direction of the appearance of a single meteor, which is also called an occasional meteor.
Fire meteors are also occasional meteors, but they are very bright when they appear, like a fire dragon and may be accompanied by ** sounds, and some are even visible during the day. Many meteors radiate outward from a certain point in the starry sky (radiant), which is called a meteor shower. Meteorites are the remnants of the largest meteoroids in the solar system that have not completely burned up after breaking into the Earth's atmosphere, and they bring us a wealth of information about the formation and evolution of the celestial bodies in the solar system, and they are welcome guests.
The density of ordinary meteoroids is very low, about 1 20 of the density of water. Every day, billions or tens of billions of meteoroids enter the Earth's atmosphere, and their total mass can reach 20 tons. Fire.
Flow. Star. The fire meteor looks very bright, like a huge glittering fire dragon, with a "rustling" sound and sometimes a ** sound. Some meteors can be seen even during the day.
The appearance of the fire meteor is due to its large mass (mass greater than a few hundred grams), which enters the earth's atmosphere and then does not burn out at high altitude and continues to break into the dense low-level atmosphere, and violently rubs against the earth's atmosphere at an extremely high speed, producing dazzling light. After the fire meteor disappears, it leaves a long cloud-like band in the path it passes through, called the "meteor remnant"; Some of the remnants disappear quickly, while others can persist for a few seconds to minutes, or even tens of minutes. Flow.
Star. Rain. Among the various meteor phenomena, the most beautiful and spectacular is the meteor shower. When it appears, thousands of meteors radiate like shining ribbons from a point in the sky (radiant).
Meteor showers are named after the constellations where the radiants are located, such as the Andromedid meteor shower, Leonid meteor shower, etc. There have been many famous meteor showers in history: the Lyrid meteor shower, the Aquariid meteor shower, the Leonid meteor shower, the Andromeda meteor shower, .......
In 687 B.C., China recorded the Lyrid meteor shower, which is the world's earliest record of a meteor shower.
Meteor showers appear regularly, and they tend to repeat on about the same days each year, which is why they are also known as "cyclical meteors".
Leonid meteor shower in '98.
Meteor showers are formed because of the "meteor swarm" composed of many meteoroids in interplanetary space, and when the Earth meets the meteor group, a large number of meteors will enter the earth's atmosphere, forming a spectacular meteor shower. Meteor swarms may be formed by the diffusion of comet material into orbit, just as Comet Billa shattered to form the Andromeda meteor shower. Is that really the case?
This is yet another celestial mystery that needs to be confirmed.
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From other planets, but these meteorites that fell on Earth could not have come from outside the solar system, and those meteorites outside the solar system had already burned up during flight.
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Meteorites that fall on Earth are asteroids that break through the atmosphere, either from inside the solar system or from outside the solar system.
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Meteorites that fall to Earth are asteroids from space that break through the atmosphere to the surface, and some of these asteroids may have come from outside the solar system.
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The Earth is covered by a thick atmosphere that protects the Earth. When a meteorite passes through the Earth's atmosphere, frictional heat disintegrates.
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Because when meteorites collide with the earth, they will have some friction with the atmosphere, and many meteorites are relatively small, and they have been exhausted after friction.
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Because the earth has gravity and gravitational pull, the number of meteorites falling on the earth is very small.
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