为何太阳系行星只剩下8颗?

在太阳系内至今为止人类研究最多的就是八大行星了,分别是金星、水星、木星、土星、地球、火星、天王星和海王星了。然而大家不知道的是,太阳系刚开始的时候可是一个“大户人家”,共有一百多颗行星聚集在太阳的周围。科学家就这样猜测:虽然当时“人丁兴旺”,但是由于空间太小,许多行星轨道互相重合,于是就因此发生了碰碰车一样的星球大战。这可是实实在在的星球大战了,各个行星之间相互碰撞,最后仅留下了四颗行星,最后经过几十亿年的发展才形成了现在我们看到了八大行星。这次的“星球大战”战况是十分激烈的。

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