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永远看不到的月球背面在很久很久以前——好多故事都是这样开头的。不过,现在我们要说的很久还要更久一点儿,是在46亿年前地球刚刚诞生的时候。一天,宇宙中发生了一次超级大碰撞,一颗小行星撞上了地球,两个天体的核心合并成了地球现在的核心,而四处散落的碎片就形成了月球。这是关于月球形成的一种说法,当然也有人认为月球是地球引力俘获来的小行星或者别的什么。不管怎么说,可以确定的是,月球是距离地球最近的邻居,跟其他天体相比,我们观测起来更方便,所以,我们对月球的了解可不算
Long, long time ago, the moon can not be seen forever - so many stories start like this. However, what we are going to say for now is a little longer, a time when the Earth was just born 4.6 billion years ago. One day a super collision occurred in the universe. An asteroid hit the Earth. The core of the two celestial bodies merged into the core of the present earth. The scattered fragments formed the moon. This is a statement about the formation of the moon, of course, some people think that the moon is a gravitational captured asteroid or anything else. Anyway, what is certain is that the Moon is the closest neighbor to the Earth and we can observe it more easily than other celestial bodies, so our understanding of the Moon is not