银河中心的超级大黑洞 the Supermassive Black Hole
不管中心黑洞是我们太阳质量的几百万倍还是几十亿倍，对不同年龄和大小的星系，这一比率都是相同的。
The ratio is the same for galaxies of all ages and sizes, whether the central black hole is a few million or many billions of times the mass of our sun.
近些年来，天文世界十大变态杀人狂学家们认识到宇宙内近处的星系全都是其中心黑洞质量的约700倍。
In recent years, astronomers have learned that galax ies in the nearby universe are uniformly about 700 times as massive as the black holes at their cores.
这些X射线脉冲花了300年从中心黑洞到达了一片巨大的云团人马座B2，于是云团对300年前的事件作出反应。
These X-ray pulses take 300 years to traverse the distance between the central black hole and a large cloud known as Sagittarius B2, so the cloud responds to events that occurred 300 years earlier.
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