仙女星系正以每秒110公里的速度靠近银河系，约40亿年内两两相撞
Synopsis
仙女星系正以每秒110公里的速度靠近银河系，约40亿年内两两相撞,本视频由北科公元原创提供,1506次播放,好看视频是由百度团队 ...
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