The moon, the name of the celestial body, is called the moon as seen by human eyes. In ancient China, it was also called Taiyin, Xuantu, Chanjuan, and Yupan. It is the satellite of the earth and the fifth largest satellite in the solar system. The diameter of the moon is about one-fourth that of the earth, and its mass is about one-eighty-one of the earth. Its surface is covered with impact 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.
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