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月球鲜为人知的事实：一个脚印可保存数百年
source link: http://tech.sina.com.cn/d/s/2017-09-26/doc-ifymfcih5346696.shtml
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新浪科技讯 北京时间9月26日消息，据国外媒体报道，月球是人们在夜晚最容易发现的天体，它是地球唯一的卫星，它在夜空中有时非常明亮，有时晕暗，只露出小月牙状。月相变化规律符合一次满月至下一次满月的变化过程，月球相位和轨道对于许多人而
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