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。
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.
仿真的结果表明，黑洞是和星系一同成长的，一些观测结果甚至显示一些含有活动星系核的星系有轻微的扭曲，这是近期发生碰撞的标志。
Simulations have found that black holes and galaxies grow together. Some observations even suggested that galaxies with active galactic nuclei were slightly distorted, a sign of a recent collision.
前陆盆地的终结标志着碰撞造山作用的结束。
The end of the sedimentation of the foreland basin indicates completion of the collisional orogeny .
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