Why are there only impact craters left on the Moon, and where have all the objects that hit it gone?

The moon was formed more than four billion years ago, and because there is no atmosphere on the surface, all extraterrestrial asteroids, meteorites, comets, etc., regardless of size, have impacted the surface of the moon without discount. Therefore, there are relatively many impact craters, and the part of the meteorite that is in contact with the lunar surface during the high-speed impact is melted by extremely high temperatures, and the upper part is broken and disintegrated due to the huge impact force.

These are all things that are done in the moment of impact. Another point to note is that, for example, a 100-meter crater is not made out of a 100-meter diameter meteorite. Since the meteorite is impacted at high speed and the kinetic energy is very large, I did not simply calculate that a meteorite with a diameter of 1 meter may cause an impact crater with a diameter of 100 meters, and at the same time, the meteorite will be broken and shattered in the impact crater at the moment of impact.

On the Moon, because there is no atmosphere, celestial bodies will not slow down when they hit the Moon, but will directly hit the surface of the Moon at high speed. Meteorites hit the surface of the moon at speeds of up to one or twenty kilometers per second, which creates a huge shock wave and releases a large amount of heat, as a result of which the meteorite shatters and melts or even vaporizes. During the impact, a huge amount of energy is released that leaves craters on the lunar surface.

Some of the meteorites that caused the accident may have bounced off and re-entered space after impact. Most of them are hard-hitting, meteorites hit the moon with huge kinetic energy, producing huge impact and instantaneous high temperatures, and the meteorites were smashed or melted. The remnants are sputtered nearby, and the sputter that accumulates around the crater is the debris produced after impact, and many craters have radial sputter deposits near them.

Moreover, these impacts are continuous, and the craters on the moon are also ring-by-ring, so it is difficult to determine exactly where the impacting celestial bodies went.

There is no gravitational force on the Moon, so the objects that hit it are scattered in the universe.

will break away from the gravitational pull of the moon and reach space

Over time, it has been weathered.

The objects that hit him were attracted to the other bodies.

I think I went to the universe.

Who knows, this may have disappeared into the universe.

He has often returned to parts of the moon or detached from the moon's gravitational pull.

It may have broken at the time of impact.

He didn't smash it if he didn't hit him.

This thing should fly into the universe.

For people who have loved watching sci-fi cartoons since childhood, they all have a space dream in their hearts, and they always dream of riding a spaceship when they are young.

Went to outer space.

Then began a journey of free exploration in outer space. Most of them have never been able to fulfill their childhood dreams, but they have all seen the moon on television.

and also found that the moon is full of craters, so how did these craters appear? <>

In fact, craters large and small on the surface of the moon are formed by the constant impact of meteorites. At first, there was no "scar" on the moon, that is, the moon was smooth at first, and after many years of meteorite impacts, its surface began to slowly accumulate a large number of uneven craters, and it is precisely because the craters on the moon are caused by meteorites that we call them craters. <>

The reason why there are so many craters on the moon is because there is no thick atmosphere on the surface of the moon.

And this also caused the meteorite to fall to the surface of the moon, because there is no atmosphere "barrier", and become unscrupulous. The reason why meteorites are so "bold" is actually because there is no atmosphere on the moon, so meteorites do not have to fear that they will be burned up due to friction with the atmosphere. When a meteorite hits the surface of the moon, because the surface of the moon lacks the protection of the atmosphere, an asteroid of any size can cause damage to the surface of the moon, which is why we can see that there are a large number of dense craters on the moon.

When meteorites hit the moon, they will directly collide with the surface of the moon and vaporize, and then form large and small, strange-shaped potholes. <>

In addition, the surface of the moon is in a state of vacuum, so the "scars" left by meteorite impacts on the surface of the moon will not be gradually weathered away with the passage of time, so we will see many large and small craters on the surface of the moon.

The Moon is a satellite of the Earth, and it revolves around the Earth, which will help the Earth resist many meteorite impacts, so many craters are formed.

Craters on the Moon are formed by meteorite impacts on the surface of planets, moons, and asteroids or other celestial bodies.

These craters are craters, which may have been formed by meteorites hitting the moon, and because there is no air and water on the moon's sails, such a form is not easy to be damaged, so it will be preserved.

In fact, there are craters on the earth, but some of them were once too old and weathered to be so severe that it is difficult for us to identify. There are lakes on Earth that are in fact craters. The Earth's peculiar structure has led to such a result, with large local meteorites hitting the sea, some craters buried by geological activity, and some asteroids that have fallen apart on the surface of the earth and have less impact on the air.

The Earth is a planet made of rock and water, with an ocean area of 71%, and in terms of probability, meteorites are more likely to hit the ocean, and the ocean water can cushion the impact. Due to the fact that the movement of the center of the earth and the movement of the surface are not synchronized, there will be changes in the earth's crust from time to time, there will be volcanic eruptions, tsunamis and other natural things, which can cover up some craters; Craters that hit land may also experience the diversion of rivers to become natural lakes, and the appearance of the crater may be gradually erased by water.

There is still an atmosphere on the earth, and the movement of the atmosphere will carry dust, and the composition of the Loess Plateau is thought to be related to the distant desert, and some craters will be formed and disappear; At the same time, atmospheric movements will corrode rocks, and the craters at the edge of the crater will also be corroded and destroyed from time to time, and the crater will be filled up and finally disappear. The terrestrial planets Mars and Venus in the solar system both have atmospheres, and it seems that there are fewer craters on Venus and Mars, while those planets without atmospheres such as Mercury and the Moon have more craters and clearer, but it is not that Mars and Venus have been hit less often. The earth has a dense atmosphere, and the friction between meteorites and the atmosphere during the high-speed fall produces a high bend of open heat, and many meteorites have burned before falling to the surface of the earth.

As a result, we sometimes see a meteor streaked across the sky.

The craters that survive on the earth are relatively large, such as the Yucatan crater associated with the extinction of the dinosaurs, but it still exists, but it has also been buried in the public, and its existence can be confirmed by measuring the mass dispersion around the crater, elemental anomalies, etc.

The main reason is that when meteorites pass through the atmosphere, they will burn by friction, and small meteorites will burn directly, and large meteorites will become small meteorites, so the impact crater will not be visible.

Mainly because the earth has an atmosphere, meteorites will friction and burn less when passing through the atmosphere, so impact craters are rarely seen.

Because most of our planet is water. And on the moon there is none, so he is pitted, but we are not. We are all covered in water.

It seems that there are so many impact craters on the moon, but there is really not much material left in the center, most of them are flat, or even very flat, how is this caused?

This is the process of small and large asteroids hitting the ground or the lunar surface, generally only the impact of an asteroid with a small mass will leave a "milk crown" spire trace in the center, but this is not an asteroid material, but the process of reverse uplift after the impact of the lunar material, which requires special conditions, so only a part of the crater on the lunar surface will leave this special structure!

Under the impact of supermassive and ultra-high-velocity commetic nuclear impacts, it is more appropriate to understand the impacting object and the impacted object in terms of fluids! Of course, not all asteroids have merged with the lunar surface, but it is just that large chunks of asteroid material cannot be seen from a distance! If the next lunar landing is popular, if you look on the lunar surface, you should be able to find the most primitive asteroid information, even the Martian meteorite is not as complete as the lunar meteorite, because Mars also has a thin atmosphere!

This is a clearer process, the lunar material is light blue, the asteroid material is brown, and the two fusion dynamic processes are vividly expressed! Of course, the real impact will not be so gentle, but a process of violent release of energy, comparable to the effect of hydrogen bombs or even more hydrogen bombs**!

In addition, the material of the asteroid is also very important, because the result of the impact of a loose material and a high-strength iron-nickel asteroid is different, and once the loose material hits it, it is like a snowball hitting the wall!

Despite the fact that the bullet is very hard, the effect of shooting on a high-strength steel plate is the picture above!

Of course, if the strength and hardness of the armor-piercing projectile are higher, it is the effect of direct penetration, but the meteorite that hits the lunar surface is not so high, but it is enough to penetrate the lunar mantle, then the molten material gushing out will fill the impact crater, producing an extremely flat effect!

It seems that the scale of the impact suffered back then was still much more severe on the front than on the back, which is why there are so many "seas" on the front side of the moon, but there are only mountains on the far side of the moon!

Therefore, the large asteroid material cannot be seen from a greater distance, and even if it can be seen, it is not an asteroid that you imagined, but it is possible that the asteroid material and the lunar mantle material are blended together!

As the von Kármán impact crater in the Akent Disk on the far side of the moon, of course, it can't run this routine, and there is a "crown" left in the middle, which shows that this formation condition is still much more difficult. I'm sorry that there is also next to it, and there is also one below, which makes the couple embarrassed!!

There are also many craters on Earth, such as the Baringer crater in Arizona in the United States, which was formed about 10,000 years ago. The Goss Crater crater in Australia, with a diameter of 24 km. The two craters in the Canadian province of Quebec, also known as craters, were formed about 100 million years ago by the impact of a pair of asteroids near Hudson Bay Bay.

The larger of the two craters has a diameter of 32 km and the smaller one has a diameter of 22 km. There are also huge craters in Mexico, Ghana and Chad in Africa, and Tajikistan in Central Asia.

Compared to the Moon, there are larger craters on Earth and fewer craters. That's because there is an atmosphere on the earth, and there are weather phenomena such as wind, snow, rain, and frost, which make it difficult to preserve craters on the earth. The moon has no atmosphere and no weather phenomena, and even the smallest and oldest craters can be preserved to this day.

Lunar meteorites, major can not float to the earth.

The Moon is more susceptible to meteorite impacts because it has no atmosphere to protect it. The gravitational pull on the moon is too small to bind the thicker atmosphere, resulting in thin air on the moon so that meteorites do not burn up in the atmosphere and can easily cross the atmosphere and crash into the surface of the moon, leaving craters behind. As a result, craters on the moon are accumulating more and more over time.

The Moon is more susceptible to meteorite impacts because it has no atmosphere to protect it. The gravitational pull on the moon is too small to bind the thicker atmosphere, resulting in thin air on the moon so that meteorites do not burn up in the atmosphere and can easily cross the atmosphere and crash into the surface of the moon, leaving craters behind. As a result, craters on the moon are accumulating more and more over time.

The first is that there is a certain impact, after all, the hilly terrain on the far side of the moon is actually a remnant of the second moon. The Moon once orbited the Earth and then embedded itself in what is now the surface of the Moon. It is not difficult to explain why the far side and the front of the moon are completely different:

They were originally sold with two planets. Because the Moon's rotation and revolution are perfectly synchronized, one hemisphere of the Moon is always facing the Earth, while the other hemisphere is always facing away from the Earth and never shows her face. Large areas of grayish-white hills stretch across the surface of the moon, rugged and vast.

This is very different from the flat terrain facing the earth.

Secondly, because the impact point was on the far side of the moon, and no lunar satellite flew past the impact point at that time, people could not get the exact location and situation of the impact in the first place. A team of researchers at Arizona State University analyzed high-resolution images taken by the LROC as it passed through the Herzplain crater before and after the impact, and not only confirmed the impact, but also accidentally discovered that the impact of the UFO had formed two connected craters, with the 18-meter-diameter crater in the east partially overlapping the 16-meter-diameter crater in the west.

Moreover, it is completely normal for the moon to be impacted, but this event is quite special. China released the world's first 1:2.5 million geological map of the full moon of the moon, and this geological map was obtained from the data obtained by China's Chang'e project, and then the data was summarized and analyzed on the surface of the moon.

The results of geological change exploration were counted. And this image of the moon makes full use of other international lunar exploration data and research results.

You know, in ancient times, the Earth had two moons, one of which was very small, and the other was the moon as we see it. The smaller moon collided catastrophically with the larger one, a theory scientists believe could be used to explain why the probe found such a big difference between the other side of the moon and the side facing the Earth. According to computer simulations, the ancient moon collided with a "small moon" (less massive), and the sedimentary effect could be used to explain the high ground on the far side of the moon.