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月球，俗称月亮，是地球唯一的天然衛星，直徑約等于地球的四分之一，質量约为地球的1/81，相对于所环绕的行星，它是体积和质量最大的卫星，并且是太陽系中第五大的衛星，也是太阳系内密度第二高的卫星，仅次...