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。
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。
The star to be moving rapidly, perhaps in an orbit around the densely concentrated stars of the galactic nucleus.
这颗星看来正在以高速运动着，其运动轨道大概就围绕着由高度密集的恒星所构成的银河系核心。
Bulge stars orbit the galactic center at a different speed than foreground stars.
银河中心恒星轨道胀在不同速度比前景恒星。
Bulge stars orbit the galactic center at a different speed than foreground stars.
银河中心恒星轨道胀在不同速度比前景恒星。
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