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Period of the Moon's Orbit - hypertextbook.com
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日期：2024-05-16
The moon is the natural satellite of earth. The diameter of earth's moon is about 3,480 km (about 2,160 mi), or about one-fourth that of earth, and the moon's volume is about one-fiftieth that of earth. The mass of earth is 81 times greater than the mass ...看更多
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