Hey all,

Hm, now this is actually pretty interesting! The article even includes weird
looking photographs of the black hole that is making the sound.

http://story.news.yahoo.com/news?tmpl=story&cid=96&e=6&u=/space/blackholestr
ikesdeepestmusicalnoteeverheard

Some excerpts:

> Astronomers have detected the deepest note ever generated in the cosmos, a
> B-flat flying through space like a ripple on an invisible pond. ... it is 57
> octaves below the keys in the middle of a piano.

So that'd be somewhere around 0.000000000000003 Hz, which I think is 1 cycle
every 9,800,000 years.

> The sound waves appear to be heating gas in the Perseus galaxy cluster, some
> 250 million light-years away, ...

- Jeff