Black Hole Sings Deepest Note

"For the first time ever, astronomers have detected sound waves coming from a massive black hole in space — and believe the discovery may help resolve a major mystery, the U.S. space agency NASA said Tuesday."

[...]

"The pitch of the sound waves, equivalent to a B-flat — 57 octaves lower than a middle-C and at a frequency far deeper than the limits of human hearing — is the deepest note ever detected from an object in the universe, researchers said."

[...]