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球俗称月亮，也称太阴。月球就是最明显的天然卫星的例子。在太阳系里，除水星和金星外，其他行星都是天然卫星。月球的年龄大约也是46亿年，它与地球形影相随，关系密切。月球也有壳、幔、核等分层结构。最外层的月壳平均厚度约为60-65公里。月壳下面到1000公里深度是月幔，它占了月球的大部分体积。月幔下面是月核，月核的温度约为1000度，很可能是熔融状态的。月球直径约3476公里，是地球的3/11。体积只有地球的1/49，质量约7350亿亿吨，相当于地球质量的1/81，月面的重力差不多相当于地球重力的1/6。月球上面有阴暗的部分和明亮的区域。早期的天文学家在观察月球时，以为发暗的地区都有海水覆盖，因此把它们称为“海”。着名的有云海、湿海、静海等。而明亮的部分是山脉，那里层峦叠嶂，山脉纵横，到处都是星罗棋布的环形山。位于南极附近的贝利环形山直径295公里，可以把整个海南岛装进去。最深的山是牛顿环形山，深达8788米。除了环形山，月面上也有普通的山脉。高山和深谷叠现，别有一番风光。 The ball is commonly known as the moon, also known as the Taiyin. The moon is the most obvious example of a natural satellite. In the solar system, except for mercury and Venus, other planets are natural satellites. The moon is also about 4.6 billion years old. It is closely related to the earth. The moon also has layers of crust, mantle and core. The average thickness of the outermost moon shell is about 60-65 km. Below the moon's crust to a depth of 1000 kilometers is the moon's mantle, which accounts for most of the moon's volume. Below the mantle is the lunar core, which is probably in a molten state with a temperature of about 1000 degrees. The diameter of the moon is about 3476 kilometers, which is 3 / 11 of the Earth's. Its volume is only 1 / 49 of the earth's, and its mass is about 735 billion tons, which is equivalent to 1 / 81 of the earth's mass. The gravity of the moon is about 1 / 6 of the earth's gravity. There are dark parts and bright areas on the moon. When early astronomers looked at the moon, they thought that the dark areas were covered with sea water, so they called them "sea". Famous are the sea of clouds, the sea of dampness, the sea of tranquility, etc. And the bright part is the mountains, where there are many mountains and mountains, and there are many ringed mountains everywhere. Bailey crater, located near the south pole, has a diameter of 295 kilometers and can accommodate the whole Hainan Island. The deepest mountain is Newton crater, which is 8788 meters deep. In addition to the crater, there are ordinary mountains on the moon. There are mountains and deep valleys. There is no other scenery. | 
