Crater The size of craters varies greatly. On the lunar surface, there are more than 3300 craters with a diameter of more than 1 km, accounting for 10% of the lunar surface area; There are countless smaller and worthy moon craters. The shapes of craters are also different. Some big craters have a small one inside, and some big craters have a deep hole in the center, such as Newton's crater, with the central hole more than 8000 meters deep; There is also a mountain called“ Central peak ”。 The name of the crater was given by Galileo. The ringed mountain is the most prominent geomorphic feature on the moon surface. The ringed mountains dotted and overlapped on the moon surface are like volcanic craters on the earth. There is a round flat land in the center and a ring of raised mountain rings on the periphery. The inner wall is steep and the outer slope is gentle.
Crater There are six craters on the front, named after Gao Pingzi, a modern Chinese astronomer, Song Yingxing, Shen Kuo, Liu Hui, Pei Xiu and Xu Guangqi [2]
In 1987, International Astronomical Union name Mercury Among the first batch of ringed mountains, there are two famous poetess in ancient China Cai Wenji And poetess Li Qingzhao This is the only two women whose names were used as outer space craters in history. 
Crater
Crater spray
The high heat inside the moon after the formation of the moon Lava And gas burst through the surface and ejected, just like the Volcano eruption 。 They began to be powerful, and lava erupted high and far, accumulating outside the vent and forming a crater. Later, the jet power gradually decreased, and the jet accumulation was only at the bottom of the center, forming a small peak, which is the central peak in the ring mountain. Some jets go out earlier, or do not spray again, there is no Central peak 。 
Crater Meteoroid Hit the moon. On May 13, 1972, a large meteorite crashed into a crater the size of a football field on the lunar surface. Caused by impact Moonquake , 4 placed on the lunar surface Lunar seismograph Record it. The proponents of meteorite impact believe that about 3 billion years ago, there were many meteorites in space, and the moon was Semi fused state 。 When the huge meteorite hit the moon, rocks and soil splashed out around it, forming a ring of ringed mountains. Because there is no wind and rain on the moon Geological tectonic activity Therefore, the original crater has been preserved. There are many craters around Radial zebra structure , such as Tycho ， Copernicus ， Kepler There are many ringed mountains with different shapes, lengths, stripes and brightness Radial striation 。 1968 American“ surveyor ”No.7 Lunar probe , took a picture Tycho Ring Mountain Some of the radiation lines. There are 12 radiation patterns in Tycho Ring Mountain, which pass through the mountains, Moon Valley , also across Moon Sea The longest radiation pattern is 1800 kilometers long, and the widest one is 20 kilometers wide. 
Crater
