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时间到了1975年，也就是阿波罗计划结束没几年。哈德曼和达维斯写了一篇论文。提出了一个假说，也就是说当地球形成的时候，在这一圈并不是只形成了地球一个大行星。而是形成了一大堆个头不大的家伙。其中有一个跟地球撞了，撞击抛射出的那些碎石头和尘埃凝聚成了月球，这个学说可以很好的解释月球的物理和化学性质。后来加拿大和美国的天文学家卡梅伦和沃德也提出了相似的理论。他们认为有一颗跟火星差不多大的原行星和地球撞了。撞击以后被抛出去的都是比较轻的硅酸盐类物质。而那些非常重的铁呀镍啊之类的东西飞不出去。最后和地球的核心融合到了一起。那些飞出去的硅酸盐类物质最后就凝结成了月球，所以月球的铁核心是非常小的。
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