因为这种碰撞会引起个体原子核的反作用，只要有适用的仪器就可以观测到这种反作用。
Such collisions should cause individual atomic nuclei to recoil, and with the right apparatus such recoils can be observed.
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.
课题小组选择了140个活动星系核，或简称agns，这些星系都放射出大量的X射线，X射线能穿透阻挡观测的气体和尘埃。
The team chose 140 active galactic nuclei, or AGNs, by selecting galaxies that emit a lot of X-rays, which can Pierce the galactic gas and dust that might otherwise block the nuclei from view.
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