在它的事件视界，即其边界，没有任何东西可以逃脱这头巨兽的引力，甚至连光也不行。 其引力相当于位于我们太阳系最外层行星轨道的海王星的四倍。

Its event horizon--theboundary at which nothing, not even light, can escape the monster’s gravitationalpull--is four times as large as the orbit of Neptune,our sun’s outermost planetary satellite.

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我们可以来看看Lyman系,也就是n等于,我们知道它的能量差更大,所以它在紫外光区内。

We can think about the Lyman series, which is 1 where n equals 1. We know that that's going to be a higher energy difference, so that means that we're going to be in the UV range.

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过去的13年中，科学家已发现我们太阳系以外的行星300多颗，但都不是直接观察到的，而是通过测量恒星周围引力、速度或光的变化而发现的。

In the past 13 years, scientists have discovered more than 300 planets outside our solar system, but they have done so indirectly, by measuring changes in gravity, speed or light around stars.

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