Lunar Circumference, what is a crater on the Moon?

Soon after the formation of the Moon, the highly hot lava and gas inside the Moon break through the surface layer and eject out, like a volcanic eruption on Earth. They began to be more powerful, and the lava erupted high and far, piling up on the outside of the vent, forming a crater. Later, the power of the jet gradually decreased, and the jet accumulation was only at the bottom of the mountain, forming a small peak, which is the peak in the crater.

Some of the injections are extinguished earlier, or there is no re-injection, and there is no ** peak.

Second, a meteoroid hits the moon. On May 13, 1972, a large meteorite crashed into a crater the size of a football field on the surface of the Moon. The moonquake caused by the impact was recorded by a four-moon seismograph placed on the lunar surface.

Proponents of meteorite impacts believe that about 3 billion years ago, there were many meteorites in space, and the moon was in a semi-molten state. When a huge meteorite hits the surface of the moon, it splatters rock and soil around it, forming a ring of craters. And because there is no wind and rain on the surface of the moon and violent geological tectonic activities, the crater formed at the beginning has been preserved.

Many craters are surrounded by radial markings, and there are at least 60 such craters, such as Tycho, Copernicus, Kepler and other craters, all of which have radial patterns of different shapes, different lengths, different number of stripes and inconsistent brightness. In 1968, the American "Surveyor" 7 lunar probe photographed some radiation streaks of Tycho crater. There are 12 radial lines in the Tycho crater, which pass through the mountains, the valley of the moon, and also cross the sea of the moon, the longest of which is 1,800 kilometers long, and the widest one is 20 kilometers wide.

I don't know the information! But know how it is formed: by a meteorite or asteroid impact!

It may have been formed by the impact of other celestial bodies, meteorites, or something, so let's take a look at the data.

of the surface of the moonCratersIt's a round pit.

The crater has long left traces after meteors and meteorites hit the moon. Therefore, it is speculated that the diameter of the crater is related to the size of the impacting object, and the depth of the crater is related to the velocity at the time of impact. Craters are formed by jets, and most craters are surrounded by craters that rise above the lunar surface, the far side of the moon.

Features of craters on the Moon:

The size of the craters varies greatly, the small craters are less than 10 kilometers in diameter, and some are only the size of a football field; The large crater is more than 100 kilometers in diameter. The middle of the crater is low, flat, and there are small peaks scattered in some areas. The inner side of the crater is steeper and the outer side is gentle.

For example, the water ice in the Korolev crater is permanently stable, because its depth acts as a natural cold trap.

The air on the ice is cold, the cold air is heavier than the surrounding air, and the cold air is a poor conductor of heat, effectively protecting the water ice below it.

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Analysis: How the craters on the moon are formed.

If you look at the surface of the moon with a telescope, you will find that on the surface of the moon, in addition to many mountains and large plains, there are many circles of different sizes, what are these circles? Astronomers tell us that these are the craters on the moon.

In the hemisphere that we can observe, there are as many as 300,000 craters with a diameter of more than 1 kilometer, and some craters can be as large as 300 kilometers in diameter.

How are these craters formed?

Some scientists believe that there was once a violent volcanic eruption on the moon, and after the spewing material solidified, the current crater was formed. Because the moon has very little gravity on the surface, huge craters are formed due to the scale of volcanic eruptions. Some scientists believe that there is no air on the moon, and meteorites can directly hit the surface of the moon, impact the erupted material, and accumulate to become the current craters.

Through their observations, they also found that these craters generally have "radial lines" that stretch several kilometers in all directions. They speculate that this is due to the fact that the material that erupts after the impact of the meteorite has no air resistance, and some of it splashes very far and spills on the surface of the moon.

Therefore, it can be assumed that those larger craters were formed by volcanic eruptions, while those smaller craters were formed as a result of meteorites hitting the moon.