英语听力：2013-09-27 地平线：黑洞吞噬—4

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As is often the case, it began with a series of observations that made no sense to anyone. A new generation of radio telescopes had come on stream on the 1950s that made it possible to see the universe in a completely different way. Almost immediately, they began to detect a series of strange, previously⁴ unseen sources of light. Nothing had ever been seen like them. 

 

These things looked very different, very strange, much more powerful, much larger, and really different than sorts of galaxies⁵ and stars in our neighbourhood.

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