英语听力：2013-10-30 地平线：黑洞吞噬—18

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If we look at it with visible light, we see that the inner parts of that galaxy, maybe a few 10 thousand light years across, is kind of ordinary. There are stars. There’s gas. There’s dust. It’s a sort of indiscriminately messy place, but it's not that special. 

 

Now if we look in different wavelengths³, for example, in radio waves, we see something completely different. Cygnus A transforms into something else entirely⁴. What we see is no longer the galaxy with its stars, but instead, we see an extreme structure spread across intergalactic space. And the structure is enormous. It stretches 500,000 light years across. And it consists of these enormous lobes⁵ of brightness, linked together by what looks like a thread of light leading to a tiny bright point at the very centre of the Cygnus A galaxy. The structure is enormously luminous⁶ and there's also a huge amount of energy just in the particles themselves because they've been accelerated close to the speed of light. So if you add up all the energy in this great structure, it's probably at least a trillion times the amount of energy that our sun puts out on a regular basis.

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