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The Lowest Note in the Universe
宇宙中的最低音
It's coming from a black hole in the Perseus Cluster, about two hundred fifty million light years away.
宇宙中的最低音是由距地球約兩億五千萬光年的
A black hole? And outer space? That makes sound?
英仙座星期群中的一個黑洞發出的。
What's happening out there is that intergalactic gas has concentrated around a cluster of galaxies, forming a cloud.
那里的星際氣體已集中在星系群周圍形成了云層。
A massive black hole is sending out jets of particles that crash into the cloud, causing pressure waves to ripple outward.
一個巨大的黑洞正在釋放粒子噴流，這些粒子噴流又撞向云層，然后就產生了壓力波向外界發出潺潺聲的情況。
Some astronomers interpret these as sound waves.
有些天文學家把這種波解釋成聲波。
Of course, even if you call it sound, it's too low for anyone to hear.
當然，即使你稱之為聲音，但它也太低了以致沒有人能聽得到。
What note is it? They estimate the note to be a "B flat", about fifty-seven octaves lower than middle C.
他們估計這種聲音屬于降B調。比中央C低57個八度音階。
Researchers now think that many black holes may produce such waves, which can affect the way galaxies, and even galaxy clusters, behave.
研究者們現在認為很多黑洞都會發出這種可以影響星系甚至是星系群的表現方式。
