A little common sense about the moon

1. A little knowledge about the moon (20 words)

The moon rotates counterclockwise from west to east, and also rotates counterclockwise around the earth. Because of tidal locking, the moon's rotation period is equal to its period of revolution around the earth, which is about 28 Earth days. In the end, the moon always faces the earth "frontally" and its back always faces the earth.

There is no wind, no rain, no clouds in the sky and no weather change on the surface of the moon. No matter day or night, the sky on the moon is always dark Looking up at the stars on the moon will be brighter than on the earth; Looking at the stars on the back of the moon will be brighter than looking at the front of the moon.

Extended data:

The split theory of the birth of the moon;

As early as 1898, George Darwin, the son of the famous biologist Darwin, pointed out in the article Tides and Similar Effects in the Solar System that the moon was originally a part of the earth, but later, due to the rapid rotation of the earth, some substances on the earth were thrown out, which formed the appearance of the moon after it left the earth, and the pit left on the earth was the Pacific Ocean.

This view was quickly opposed by some people. They think that it is impossible to throw such a big thing at the speed of the earth's rotation. Besides, if the moon was thrown out by the earth, then the material composition of the two should be the same. However, through the analysis of the rock samples brought back from the moon by Apollo 12 spacecraft, it is found that there is a great difference between them.

The rocks on the surface of the moon are extremely old, ranging from 3 billion years to 4.2 billion years. The oldest rocks on the earth's surface are limited to metamorphic rocks exposed in some areas 3.8 billion years ago, while the rocks on the bottom of the Pacific Ocean are extremely young, which is completely contrary to the "split" theory.

People's Network-The Little-known "Other Side" of the Moon

There is little knowledge about the moon.

There is no atmosphere, no moisture, no wind, frost, rain and snow, no rivers, lakes and seas, and no life phenomenon of birds and flowers.

In a word, the moon is a dead planet. However, this does not mean that there is no change on the surface of the moon, and the luminous phenomenon on its surface is an example.

Sometimes the surface of the moon will suddenly appear some kind of luminescence phenomenon, and even the color will change, which has aroused the interest and concern of astronomers. 1958165438+1in the early morning of October 3, a scientist from the former Soviet Union, Kozlev, observed the lunar crater and found that the central peak in alfin crater became dark and fuzzy, and it gave off a red light that had never been seen before.

More than two hours later, when he looked at this area again, the mountain peak gave off white light, and the brightness was almost doubled than usual. The next night, alfin crater was restored to its original appearance. Kozlev believes that what he observed was a rare lunar volcanic eruption.

He said that the reason why the brightness of the central peak of alfin crater increased was that gas was ejected from the interior of the moon. At first, the peak was dark red, because under the pressure of gas, volcanic ash rushed out of the crater first. Kozlev's view was opposed by some people, including some famous astronomers.

They acknowledge the existence of anomalies in alfin crater; However, people think that it can not be explained by the usual volcanic eruption, but by the gas release process that sometimes occurs in some parts of the moon. Under the sunlight, even cold gas will show the characteristics that Kozlev noticed.

As early as 1955, Kozlev found a similar abnormal light phenomenon in the mouth of another crater-Alistair crater, and he also suspected that it was a volcanic eruption. 196 1 year, Kozlev observed the familiar anomalies in the center of Alistair crater. The difference is that spectral analysis clearly confirms that the gas spilled this time is hydrogen.

How to explain this phenomenon? Is it a volcanic eruption? Or gas release? Or what other phenomenon? Red dot astronomers have found mysterious red dots on the surface of the moon more than once. This is also Alistair crater. Two astronomers at the Lovel Observatory in the United States discovered two red dots that surprised them when they were observing and mapping it and its nearby moon.

The first time was1October 29th, 1963, 10. A * * found three spots: first, an oval spot was seen about 65 kilometers east of Alistair, which was orange-red, about 8 kilometers long and 2 kilometers wide. A small circular spot near it is clearly visible, with a diameter of about 2 kilometers.

It took about 25 minutes for these two spots to go from dark to bright and then disappear completely. The third spot is a reddish stripe about 17 km long and 2 km wide, which is located inside the southeast edge of Alistair crater, and its appearance and disappearance time is about 5 minutes later than those two spots.

The second time they observed strange erythema was on 1 month later165438+1October 27th, also near Alistair crater. Erythema is about 19 km long and 2 km wide, and it exists for 75 minutes. This time, due to the abundant time, not only several colleagues from Lovel Observatory saw the red spot, but also took some photos.

In order to confirm that the observed phenomenon really exists, they also specially called another observatory and told their friends there to observe the abnormal phenomenon on the moon quickly, but deliberately did not specify where it was on the moon. Dawentai, which got the news, immediately searched with a reflective telescope with the aperture of 175cm (two astronomers at Lowell Station used a 60cm refractive telescope) and soon found the target.

As a result, the positions of erythema observed by the two stations are completely consistent, which shows that the observation is correct. Erythema is indeed a phenomenon on the surface of the moon, not a mirage caused by the earth's atmosphere or other factors.

These two color anomalies occurred in the area of Alistair crater, and both occurred within less than two days after it began to be exposed to sunlight. Considering these aspects, some people think that the phenomenon of red spots on the surface of the moon may not be too rare, but they don't know when and where they appear, and the time of appearance and existence is generally not long. It is not so easy to observe them, which requires large-scale suitable observation instruments and rich observation experience and skills. At the same time, people think that this phenomenon may be related to the sun and its activities.

Another view is that this phenomenon of brightness and luminescence often occurs, and there are at least 300 recorded similar events in Alistair crater area alone, indicating that they are caused by some or some permanent reasons inside the moon. 1In July, 1969, when the Apollo 1 1 spacecraft landed on the moon for the first time, it observed the brightest Alistair crater area on the moon.

This famous crater is about 37 kilometers in diameter, with steep walls, complex structure and rough and rugged bottom. Armstrong, the commander of the spaceship, looked down from the northern part of the crater. He reported to the ground command center: "A place near the crater is obviously much brighter than its surroundings, and there seems to be something similar to fluorescence."

Unfortunately, the astronauts did not further explain the observed phenomenon. Red light phenomenon When two scientists from Lovel Observatory discovered the red spot near Alistair crater, two scientists from Britain noticed a similar phenomenon in Kepler crater, another famous crater.

Kepler crater is located in the southeast of Alistair crater, with a diameter of about 35 kilometers. This is one of the few craters with radiation patterns. 1 963165438+1October1day, two researchers from Manchester University, England, when taking photos of Kepler Crater and its surrounding area, noticed that this area appeared twice in two hours, and the luminous area was large, each time exceeding1day.

They put forward their own views on this colored phenomenon from three aspects. First of all, they pointed out that the luminous phenomenon with short duration and such a large area could not be caused by some reason inside the moon, but.

3. What is the knowledge about the moon?

The moon is the most thoroughly studied celestial body. So far, the second celestial body visited by human beings is the moon. The moon is about 4.6 billion years old. Like the earth, the moon has a layered structure such as shell, mantle and core. [1] The average thickness of the outermost shell of the moon is about 60-65km. The depth from the lunar crust to 1000 km is the lunar mantle, which accounts for most of the lunar volume. The temperature of the moon's core is about 1000 degrees, and it is likely to be in a molten state. The moon is about 3474.8 kilometers in diameter, which is about 1/4 of the earth and 1/400 of the sun. The distance from the moon to the earth is equivalent to 1/400 of the distance from the earth, so from the earth, the moon is as big as the sun. The mass is about 735 billion tons, which is about 1/8 1 of the earth's mass, and the surface gravity of the moon is about 1/6 of the earth's gravity. The moon always faces us, which is customarily called the front. On the other hand, due to Libra's movement, most of the back of the moon is invisible from the earth except the area near the edge of the moon. The back of the moon has always been an unknown world. One of the characteristics of the back of the moon is that there is almost no dark moon surface, such as the moon sea. When the artificial probe runs to the back of the moon, it will not be able to communicate directly with the earth. The moon orbits the earth once every 27.32 1666 days, and moves half a degree relative to the background starry sky every hour, which is similar to the apparent diameter of the moon. Unlike other satellites, the orbital plane of the moon is closer to the ecliptic plane than. The time between the new moon and the next one (or between two identical phases of the moon) is called the new moon. The new moon is longer than the sidereal moon, because when the earth runs on the moon, it moves forward some distance around the sun's orbit. Strictly speaking, the Earth and the Moon revolve around a concentric center, which is 4,700 kilometers away from the center of the Earth (that is, 3/4 of radius of the earth). Because * *. Moreover, the moon goes clockwise around the earth; Even the earth moves clockwise around the sun. This phenomenon occurs because the angular momentum of the earth and the moon relative to the sun is the same, that is, "rotating in this direction from the beginning." The moon itself does not shine, but reflects sunlight. The brightness of the moon changes with the angular distance between the sun and the moon and the distance between the earth and the moon. The average brightness is 1/465000 of the brightness of the sun. Brightness varies from 1/630000 to 1/375000. At the full moon, the average brightness is-12.7, etc. (see). Its average illumination to the earth is 0.22 lux, which is equivalent to the illumination of a 100 watt electric lamp at a distance of 2 1 meter. The remaining 93% is absorbed by the moon. The albedo of Yuehai is even lower, about 6%. The albedo of the lunar highlands and craters is 65,438+07%, which makes the mountains brighter than the moon sea. The brightness of the moon changes with the phase of the moon, and the brightness of the full moon is more than ten times higher than that of the first quarter moon. Because there is no atmosphere on the moon, the heat capacity and thermal conductivity of lunar materials are very low, so the surface of the moon is day and night. The temperature can be reduced to-183℃ at night. These values only represent the temperature on the surface of the moon. The temperature of lunar soil can be measured by radio observation. This measurement shows that the temperature in the deeper part of the lunar soil rarely changes, which is precisely caused by the low thermal conductivity of lunar material. From the propagation of lunar seismic waves, it is known that the moon also has layered structures such as shell, mantle and core. The outermost lunar shell is 60-60. 1000 km deep is the lunar mantle, which accounts for most of the lunar volume. Below the lunar mantle is the lunar core. The temperature of the lunar nucleus is about 1000℃, which is probably in a molten state. It is speculated that it may be composed of iron, nickel, sulfur and eclogite. The average track radius is 38440 1km and the track eccentricity is 0.0549. Perigee distance is 366. 500 kilometers. Period of revolution has an average of 27.32 days. The average speed is1.023km/s. Orbit inclination varies between 28.58 and 18.28. Right ascension is 125.08. The perigee divergence is 3 18. 15. Mo Dong Zhang is 19. The average distance between the moon and the earth is 384400 kilometers. The regression period of this node is 68400 km. 6.6 days. The Sharon period is1810/1/day. The average inclination of the track and ecliptic is 5. The average inclination of the equator and ecliptic of the moon is 1. The equatorial diameter is 3476.2 kilometers. The polar diameter is 3. 472.0km, flatness of 0.00 12. The surface area is 3.79 * 10 7 km2. The volume is 2. 199 * 10 cubic kilometer. The mass is 7.349 * 10 22kg. S2 (65438+ 0/6 of the earth). The escape speed is 2.38km/s and the rotation period is 27 days, 7 hours and 43 minutes 1 1.559 seconds (synchronous rotation). The rotating speed is16.655m/s (at the equator). The included angle between axis inclination and ecliptic is 1.5424. The albedo is 0. 12. The apparent magnitude of the full moon in the universe is-12.74. The surface temperature is (t)-233 ~ 12. 10- 10 kPa. Month period: the name value (unit: day) defines that the stellar month 27.32 1.66 1 is close to the vernal equinox relative to the background star Shuoyue 29.530.588 and the sun (moon phase) and vernal equinox month 27.32 1.582. The diameter of 38+02 220 relative to the rising point of the moon is 1/4 of the average diameter of the earth, and its mass is only 1/8 1.

4. Little knowledge about the moon (20 words)

The moon rotates counterclockwise from west to east, and also rotates counterclockwise around the earth.

Because of tidal locking, the moon's rotation period is equal to its period of revolution around the earth, which is about 28 Earth days. In the end, the moon always faces the earth "frontally" and its back always faces the earth.

There is no wind, no rain, no clouds in the sky and no weather change on the surface of the moon. No matter day or night, the sky on the moon is always dark

Looking up at the stars on the moon will be brighter than on the earth; Looking at the stars on the back of the moon will be brighter than looking at the front of the moon. Extended data:

The split theory of the birth of the moon: As early as 1898, George Darwin, the son of the famous biologist Darwin, pointed out in the article Tides and Similar Effects in the Solar System that the moon was originally a part of the earth, but later, due to the rapid rotation of the earth, some substances on the earth were thrown out, which formed the moon after leaving the earth, and the pit left on the earth was the Pacific Ocean.

This view was quickly opposed by some people. They think that it is impossible to throw such a big thing at the speed of the earth's rotation.

Besides, if the moon was thrown out by the earth, then the material composition of the two should be the same. However, through the analysis of the rock samples brought back from the moon by Apollo 12 spacecraft, it is found that there is a great difference between them.

The rocks on the surface of the moon are extremely old, ranging from 3 billion years to 4.2 billion years. The oldest rocks on the earth's surface are limited to metamorphic rocks exposed in some areas 3.8 billion years ago, while the rocks on the bottom of the Pacific Ocean are extremely young, which is completely contrary to the "split" theory. People's Network-The Little-known "Other Side" of the Moon.

5. Popular science knowledge about the moon

The moon seen by human naked eyes, also known as the moon, mysterious earth, Chanjuan and Pan Yu in ancient times, is the satellite of the earth and the fifth largest satellite of the solar system. The diameter of the moon is about a quarter of that of the earth, and its mass is about 181 times that of the earth.

The moon is the largest known satellite on the earth, and its surface is covered with craters formed by the impact of small celestial bodies. The average distance between the moon and the earth is about 384,400 kilometers, which is about 30 times the diameter of the earth.

The moon may have formed about 4.5 billion years ago. Shortly after the formation of the earth, there were several hypotheses about its origin. The theory supported by more factual evidence is that it was formed in the theory of the origin of the great collision, and the debris generated by the huge collision between the earth and the Martian-sized celestial body "Teia" gathered around the earth.

Extended data:

The moon revolves around the earth with a period of 27.5438+066, which happens to be a sidereal moon, so we can't see the back of the moon. This phenomenon, which we call "synchronous rotation" or "tidal locking", is almost a universal law in the satellite world of the solar system.

It is considered to be the result of long-term tidal action of satellites on the planet. Balance is a wonderful phenomenon, which shows us 59 planes. There are mainly the following reasons:

1. In different parts of the elliptical orbit, the rotation speed does not match the revolution angular speed.

2, the intersection of the white road and the equator.

The appearance of the moon moves half an hour relative to the background sky, which is similar to the apparent diameter of the moon surface. Unlike other satellites, the orbital plane of the moon is closer to the ecliptic plane than the equatorial plane of the earth. Relative to the starry background, the time required for the moon to go around the earth (the moon rotates) is called the sidereal month.

The time between the new moon and the next month (or the time between two identical stages) is called the lunar month. The reason why the moon is longer than the sidereal moon is that when the earth runs on the moon, it moves forward a distance in its orbit around the sun.

Baidu Encyclopedia-Moon (Name of Celestial Body)

6. 10 scientific knowledge about the moon

The moon, commonly known as the moon, is a satellite orbiting the earth. It is the only natural satellite on the earth. It is also the closest celestial body to the earth (with an average distance of 384,400 kilometers). The moon is the most thoroughly studied celestial body. The second celestial body visited by human beings so far is the moon. The moon is about 4.6 billion years old. Like the earth, the moon has a layered structure such as shell, mantle and core. The average thickness of the outermost lunar shell is about 60-65 kilometers. Depth below the lunar shell 1000 km. It occupies most of the volume of the moon. Below the moon's mantle is the moon's core, whose temperature is about 1000 degrees, which is likely to be in a molten state. The diameter of the moon is about 3476 kilometers, which is 1/4 of the diameter of the earth and 1/400 of the diameter of the sun. The distance from the moon to the earth is equivalent to 1/ of the distance from the earth to the sun. So from earth, the moon is as big as the sun. The volume of the moon is only 1/49 of that of the earth, and its mass is about 735 billion tons, which is equivalent to about 1/80 of the mass of the earth. The gravity on the surface of the moon is about 1/6 of that of the earth.

7. knowledge about the moon

The mid-moon mantle and the sub-moon mantle are composed of basic rocks. The moon is the only natural satellite of the earth. It can be considered that the moon core is not composed of heavy elements such as iron and nickel, and the wave velocity of the moon earthquake changes sharply. Based on our understanding of the internal conditions of the moon. Last month, the mantle was composed of forsterite-rich, indicating that there are obvious discontinuities at these depths, such as the mid-moon mantle (300-800 km), the monthly seismic zone (800- 1000 km), the asthenosphere (1000- 1600 km) and the lunar nucleus (800-/600 km). The lunar lithosphere can be further divided into four layers, which may be plastic or partially molten, namely the lunar crust (0~60 km). Because the density of rocks on the surface of the moon is not much smaller than the average density of the whole moon, we can know that there is also a circular structure inside the moon today. There is a layer of lunar soil with a thickness of several meters to tens of meters on the surface of the moon, which is also the result of the differentiation of the whole lunar material layer during the evolution of the moon, but it is not exactly the same as the inner structure of the earth, with a depth of 25 kilometers and 60 kilometers. The asthenosphere is also called the next moon curtain. Above, the mantle structure of the moon and last month (60-300 km). At the depth of the moon 1000 km, it consists of gabbro and gabbro. The location of the lunar focal point is between 600~ 1000 km. The whole moon can be regarded as the lithosphere of the moon (0~ 1000 km), and the solid part of the lithosphere structure is not unique to the earth itself. Therefore, the temperature of the lunar mantle will not be higher than 1000℃, and the lunar surface is the first layer of lunar shell composed of basalt to a depth of 25 kilometers. According to the data analysis of Apollo 1 1 and Apollo 12 established on the moon, the average focal depth of the moon is 800 kilometers, and the second layer of the moon shell is between 25 kilometers and 60 kilometers, as well as the research on the moon surface and moon rocks. At the moon shell 10 km, there is a close evolutionary relationship with the earth.

References:

/Earth/Moon

8. Little common sense about the moon (about 200 to 300 words)

The moon is the only natural satellite of the earth and has a close evolutionary relationship with the earth.

According to the analysis of the recorded data of Apollo 1 1 2 and the study of the moon surface and moon rocks, it is known that the moon today has a circular structure, but it is not exactly the same as the earth. There is a layer of lunar soil several meters to several tens of meters thick on the surface of the moon.

The whole moon can be considered to be composed of lunar lithosphere (0~ 1000 km), asthenosphere (1000~ 1600 km) and lunar core (1600~ 1738 km). The lunar lithosphere can be further divided into four layers, namely, the lunar crust (0~60 km), the last lunar mantle (60~300 km), the mid-moon mantle (300~800 km) and the lunar seismic belt (800 ~ 1000 km).

The asthenosphere is also called the next moon curtain. At the depths of the lunar shell 10 km, 25 km and 60 km, the wave velocity of the lunar earthquake changes sharply, indicating that there is obvious discontinuity at these depths.

The surface of the moon is composed of basalt. The first lunar crust is 25 kilometers deep, and the second lunar crust is composed of gabbro and anorthite between 25 kilometers and 60 kilometers. Last month's mantle was composed of olivine rich in magnesium, while the mid-month mantle and the next month's mantle were composed of basic rocks.

The focal position of the moon is between 600~ 1000 km, and the average focal depth of the moon is 800 km. Because the density of rocks on the surface of the moon is not much smaller than the average density of the whole moon, it can be considered that the moon core is not made of heavy elements such as iron and nickel, but may be plastic or partially melted.

At the depth of 1000 km on the moon, the temperature of the lunar mantle will not be higher than1000 C. According to the understanding of the internal situation of the moon, the solid part of the circle structure is not unique to the earth itself.

The above structure of the lunar sphere is also the result of the differentiation of the whole lunar material sphere during the evolution of the moon.

9. What's the common sense about the moon?

Moon: The moon is commonly known as the moon, also called the moon.

The moon is the most obvious example of a natural satellite. In the solar system, all planets except Mercury and Venus have natural satellites.

The moon is also about 4.6 billion years old and is closely related to the earth. The moon also has layered structures such as shell, mantle and core.

The average thickness of the outermost lunar shell is about 60-65 kilometers. Below the lunar crust to the depth of 1000 km is the lunar mantle, which occupies most of the volume of the moon.

Below the moon's mantle is the moon's core, whose temperature is about 1000 degrees, which is likely to be in a molten state. The moon is about 3476 kilometers in diameter, which is 3/ 1 1 of the earth.

Its volume is only 1/49 of the earth's, and its mass is about 735 billion tons, which is equivalent to 1/8 1 of the earth's mass. The gravity on the surface of the moon is almost equal to 1/6 of the gravity of the earth. The moon is the only natural satellite on the earth: orbital radius: 384,400km from the earth; planet diameter: 3,476 km; Mass: 7.35e22 Of course, the moon was known as early as prehistoric times.

It is the second brightest object in the sky after the sun. Because the moon orbits the earth once a month, the angles between the earth, the moon and the sun are constantly changing; We call it the new moon.

It takes 29.5 days (709 hours) for a continuous new moon to appear, which varies with the orbital period of the moon (measured by stars) and the synchronous revolution of the earth around the sun. The gravitational field between the earth and the moon has formed an interesting phenomenon.

The most obvious phenomenon is the tidal phenomenon. The moon is the most attractive to the earth, and the opposite point is relatively weak.

The earth, especially the ocean, is not completely fixed, but extends slightly to the moon. From the surface of the earth, we will see that there are two expansion points on the surface of the earth, one facing the moon and the other facing the opposite side.

This effect is much stronger for the ocean than the ordinary crust, so the ocean expands higher. In addition, because the earth rotates faster than the moon in orbit, it expands once a day and there are two big tides every day.

But the earth is not completely fluid, and the earth's rotation causes the earth to expand very slightly under the moon. This means that due to the torsion of the earth's rotation and the acceleration on the moon, the influence between the earth and the moon does not completely exist in the straight line between the two spherical centers.

This also enables the earth to continuously provide rotational energy to the moon, slowing the rotation speed by 65,438 0.5 microseconds per century, and increasing the moon's orbit around the earth by 3.8 meters per year. The opposite result also led to the unusual orbits of Phobos and Triton.

Asymmetric gravitational interaction also synchronizes the rotation of the moon. For example, its orbital phase is always relatively fixed, so that the side facing the earth remains unchanged.

Because the rotation of the earth is slowed down by the influence of the moon, the rotation speed of the moon was slowed down by the earth a long time ago, but the force at that time was much greater. When the rotation speed of the moon slows down to a suitable orbital period (so that the expansion point is at the correct point of the earth), there will be no extra torque and the situation of the moon will be stable.

This also happens on other satellites in the solar system. Eventually, the earth's rotation will be slow enough to carry out the lunar cycle, just like Pluto and Phobos.

The moon has no atmosphere. However, the evidence from Clementine aircraft shows that there may be solid water ice at the south pole of the moon, which is the permanently dark side of the Great Circle Mountain.

This has been confirmed by the lunar probe. Obviously, there is ice in the north pole of the moon, so the price of future lunar exploration will be slightly cheaper! The average thickness of the lunar crust is 68km, from 0km under the moon sea to the back of Korolev107km.

Below the earth's crust is the mantle, or it may be the core. However, unlike the earth's mantle, only a part of the moon is particularly hot.

Strangely, the centroid and geometric center of the moon are 2 kilometers away from the earth. Similarly, its shell is very thin on this side.

There are two main landforms on the surface of the moon: huge craters and ancient plateaus, and a relatively smooth and young moon sea. Maria terrain (covering 16% of the moon's surface) was eroded by hot lava from the volcano.

Most of the surface is covered by dust in calcareous soil and stone fragments hit by meteors. For some reason, Maria's terrain is concentrated on the side near the earth.

Most craters and volcanoes around the earth are named after celebrities in the history of science, such as Tycho, Copernicus and Ptolemy. More modern names are used on the back, such as Apollo, Gagarin and Korolev (because the first photo was taken by Lunar 3, there is obvious Russian bias).

In addition, similar to the near area, there is a giant crater south pole-aitken on the back of the moon, with a diameter of 2,250km and a depth of12km. It is the largest impact basin in the solar system, and a mountain forms on the west side, which is typical of the heavy mountains in the solar system. (Seen from the earth; Center on the left).

Most of the stones on the surface of the moon seem to be between 3 billion and 4.6 billion years old, which is a coincidence with the extremely rare stones over 3 billion years old on earth. In this way, the moon provides evidence of the early history of the solar system that cannot be found on earth.

According to the previous research on Apollo samples, there are three main theories about the origin of the moon: accretion says that the earth and the moon were formed in the solar nebula at the same time; Fission says that the moon split from the earth; The capture said that the moon was formed in other places and was later captured by the earth. These theoretical evidences are not sufficient, but the latest and most detailed information from the moonstone leads to the collision that the earth was hit by a big object (the size of Mars or even larger) and the moon was formed by ejected parts.

New information is constantly being discovered, but the collision theory is now widely accepted. There is no global magnetic field on the moon, but some stones on its surface have residual gravity, indicating that there was a global magnetic field in the early days of the moon.

10. Knowledge about the moon is short-lived.

1. The size of the moon is only 1/49 of the earth.

2. The gravity on the surface of the moon is about 1/6 of that of the earth.

The name crater was first named by Italian astronomer Galileo.

The deepest crater on the moon is Newton crater with a depth of 8788 meters.

The front of the moon always faces the earth.

6. There is a great temperature difference between day and night on the surface of the moon, with the highest temperature of+127℃ during the day and-183℃ at night.

7. The land on the moon is much older than the ocean on the moon, and it is the oldest topographical feature on the moon.

8. On the front of the moon, the area of the moon land is roughly equal to that of the moon sea, but on the back of the moon, the area of the moon land is much larger than that of the moon sea.

9. The moon sea is not a sea, but a dark part of the moon surface, which is actually a vast plain on the moon surface.

10. There are 22 confirmed moons, 3 in the back, 4 in the edge area and 15 in the front.

1 1. The largest moon sea is called "storm sea", which is 9 times as big as France.