太阳系围绕银河🌌转一圈要两亿多年

Our solar system 我们的太阳系 takes 花费 225million 两点二五亿 years 年 to rotate around 环绕转圈 the Milky Way. 银河系

The last time Earth was in its current position, dinosaurs were just beginning to roam the Earth. 上一次太阳系在银河系的这个位置时,地球上的恐龙还刚刚开始繁盛。

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