The article wrote:(SPACE.com) - Astronomers have detected the deepest note ever generated in the cosmos, a B-flat flying through space like a ripple on an invisible pond. No human will actually hear the note, because it is 57 octaves below the keys in the middle of a piano.
How low a note *is* that? That's pretty low.
You can lookup the frequencies of notes on the piano.
http://www.mjorch.com/hertz.html
NOTES ARE WITHIN 3%
You can see that each note is about 5.9% different from the next. That is, A is 5.9% lower than B-flat, which is 5.9% lower than B. So when a scientist says a note is B-flat, then it must be within 3% of B-flat otherwise it would actually be closer to A or B.
LOWEST AUDIBLE NOTES
If you lower a note by one octave, the frequency is cut in half.
The A next to middle C is 220Hz (vibrates at 220 cycles per second).
The A below that is 110 Hz.
The A below that is 55 Hz.
The A below that is 27.5 Hz, the lowest note on a piano.
The human ear can hear down to about 20Hz, but our body can feel thumping vibrations down to about 2-4 Hz. If you grab a chair while somebody is sitting in it, and shake it as fast as you possibly can, you might be able to give them a vibrating massage as fast as 3 cycles per second. You can't hear it, but they sure can feel it!
THE EXPONENTIAL POWER OF 2
How low is 57 octaves below middle C? For one octave down, just divide by 2. For two octaves, divide by 4. For three octaves divide by 8. Then 16, 32, 64, 128, 512, 1024, etc. It multiplies incredibly fast from there!
B-flat (233.082 Hz) would have to be divided by 2^57, which comes out to 1.61733 x10^(-15).
That's one full vibration every 20 million years!
If you grab a chair while somebody is sitting in it, take 10 million years to pull them across the room, then another 10 million years to push them back, that's what it would feel like.
Heck, it would take over 10 millions years of listening just to identify what note you are actually listening to! If the frequency was off by just 3% then you could say "Hey, that's not B-flat! That's a A!" That would mean waiting 20.6 million years instead of 20 million for a full vibration. The extra 600,000 years makes it a half note lower.
FOR ADDED MEASURE
The note from this black hole mixes with the notes of galaxies, quarks, and other blacks holes to form chords, beats and measures all around us. The cosmic song that's produced snaps it's finger and taps it's foot about once every billion years. Cool baby, cool, yeah. It's happenin' big time!