Next, the astronomers checked the galaxies for the subtle signs of a recent galactic collision, such as a warped disk or a trailing tail of stars.

接下来，天文学家们检测了近期发生星系碰撞的微妙标志，例如扭曲的碟状中心或者拖着尾巴的恒星。

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Only one minor collision occurred about four hours into the race, when MIT's confused Land Rover crunched the tail end of Cornell's autonomous Tahoe.

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