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月球背面有外星人基地？别闹了！真相是这样...
source link: http://tech.sina.com.cn/d/2018-04-16/doc-ifzcyxmv1893791.shtml
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来源：知识就是力量微信公众号月球是地球唯一的天然卫星，陪伴地球已经超过45亿年。它对地球地轴指向、自转稳定性、周期潮汐、夜晚照明等有着巨大意义。可以说，离开了月球，地球根本不会是今天这种光景。由于地球强大引力的影响，月球也为之付出了一定代价
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