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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?
比如来自NGC 4485与其较大的星系邻居NGC 4490曾经就发生过一场大碰撞。 仙女座系和银河系相撞也是发生在几十亿年之后的,那个时候有没有人类的 ...
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