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壹线生活 on MSN
13 天
仙女座系正在以每秒110千米的速度撞向银河系,我们会有危险吗?
银河系和仙女座系都是很大的星系,银河系的直径达10万光年,仙女座系要比银河系还要大一些,仙女座系的直径达到了22万光年,而两个星系之间的距离有254万光年。
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