We know that they exist from the impact they have on their surroundings: causing nearby stars to orbit galactic centres at breakneck speeds, for instance.
我们都知道，他们以对周围环境的影响而著称：比如，使周围恒星以极快的（可以折断你的脖子的）速度绕星系中心运转。
In some simulations, the stars spread along a full orbit around the galactic center.
在一些模拟场景中，恒星们会沿着一个完整的轨道围绕银河系中心运转。
Their stars orbit the galactic center, like those in the disks of spiral galaxies, but they do so in more random directions.
这些恒星象螺旋星系中的恒星一样围绕星系中心运转，但在方向上更随机一些。
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