Way Off facts · 🎵 Music
Astronomers detected a black hole 'singing' the deepest note ever found — how many octaves below middle C is it?
57
octaves below middle C
A black hole in the Perseus cluster hums a B-flat 57 octaves below middle C — the deepest note ever detected, with one 'wave' every 10 million years.SOURCENASA Chandra X-ray Observatory
Scale check: 57 is roughly a five-a-side match, both teams.
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