# Black Hole Sonification. Saddest of all Keys?

#### Killing Floor

##### Poster Extraordinaire
Silver Supporter
The black hole at the center of Perseus emits pressure waves that create a sound that humans cannot hear (because our heads are up Uranus) that is 57 octaves below middle C.
Chandra’s team creates some of the most beautiful images and videos related to astrophysics. Enjoy.

#### drmordo

##### Friend of Leo's
It's like, how much more black could this hole be? And the answer is none. None more black.

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#### Willie Johnson

##### Friend of Leo's
Does this black hole emit the notorious Brown Note?

#### aging_rocker

##### Friend of Leo's
...57 octaves below middle C...

I've seen the late Robbie Shakespeare play live - I reckon he could get close to that.
Such powerful and low bass that I thought the world was being sucked out of MYanus...

#### John Backlund

##### Poster Extraordinaire
Gold Supporter
How does 'sound', or 'pressure waves', work in the vacuum of space?

#### JL_LI

##### Poster Extraordinaire
How does 'sound', or 'pressure waves', work in the vacuum of space?

Understanding physics starts with understanding simple explanations so this is the simple explanation I'd give someone learning of the concept for the first time. Sound works in space the same way it does on earth. Space isn't as empty as you think. Particles travel in a disk around the black hole. The disk spins. There are vibrations that propagate as a wave through the revolving disk. The frequency is low, 57 octaves below middle C so the sound is far below any frequency we would be able to hear, but propagated as a wave through the disk, it can be thought of as sound.

#### Deeve

##### Poster Extraordinaire
Silver Supporter
57 octaves below middle-C?
What kind of sub-woof cabs are needed for that?
Sheesh - Deeve

#### John Backlund

##### Poster Extraordinaire
Gold Supporter
Understanding physics starts with understanding simple explanations so this is the simple explanation I'd give someone learning of the concept for the first time. Sound works in space the same way it does on earth. Space isn't as empty as you think. Particles travel in a disk around the black hole. The disk spins. There are vibrations that propagate as a wave through the revolving disk. The frequency is low, 57 octaves below middle C so the sound is far below any frequency we would be able to hear, but propagated as a wave through the disk, it can be thought of as sound.
Yes, but.... If a tree fell into a black hole and nobody could hear it, did it really happen?

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#### trev333

##### Telefied
Black hole sonification
Won't you come
And wash away the rain?
Black hole sonification
Won't you come
Won't you come
Won't you come

#### uriah1

##### Telefied
Gold Supporter
It will probably be inducted into the rock and roll hall of fame.

#### Tonetele

##### Poster Extraordinaire
Could anyone actyally hear that low a frequency>
I've heard , and foubd, D Minor is the saddest key.

#### Chester P Squier

##### Friend of Leo's
If you take 2 to the 57th power and divide that into the frequency of middle C, which is 255 Hz, you will find that it would take several seconds for one Hz.

I haven't calculated this yet. It might be minutes. Or hours. Or days for one Hz.

Vendor Member

#### Flip G

##### Tele-Holic
John Barry did it first.

#### Killing Floor

##### Poster Extraordinaire
Silver Supporter
How does 'sound', or 'pressure waves', work in the vacuum of space?

Great question. I was wondering the same thing. Turns out in these regions there are dense clouds of hot gasses that can conduct energy. The video addressed that.

#### Killing Floor

##### Poster Extraordinaire
Silver Supporter
It will probably be inducted into the rock and roll hall of fame.

#### Timbresmith1

##### Friend of Leo's
The black hole at the center of Perseus emits pressure waves that create a sound that humans cannot hear (because our heads are up Uranus) that is 57 octaves below middle C.
Chandra’s team creates some of the most beautiful images and videos related to astrophysics. Enjoy.

57 octaves below middle c is a silly way for the author to phrase it.
Middle C is 256hz (in the US)
Each octave down represents 1/2 the frequency.
128
64
32
16
8
4
2
1 (this is 8 octaves…1 cycle per second)

#### Killing Floor

##### Poster Extraordinaire
Silver Supporter
Understanding physics starts with understanding simple explanations so this is the simple explanation I'd give someone learning of the concept for the first time. Sound works in space the same way it does on earth. Space isn't as empty as you think. Particles travel in a disk around the black hole. The disk spins. There are vibrations that propagate as a wave through the revolving disk. The frequency is low, 57 octaves below middle C so the sound is far below any frequency we would be able to hear, but propagated as a wave through the disk, it can be thought of as sound.
This is a measurable wave that is scaled into sound. By definition Sonification is the conversion of data into sound.

#### Killing Floor

##### Poster Extraordinaire
Silver Supporter
57 octaves below middle c is a silly way for the author to phrase it.
Middle C is 256hz (in the US)
Each octave down represents 1/2 the frequency.
128
64
32
16
8
4
2
1 (this is 8 octaves…1 cycle per second)
Space Octaves!