You DO understand that there aren't 57 octaves in the audible range? Plus the human ear can hear notes at like 10 Hertz, right.
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I think you misread my post.
Originally Posted by http://chandra.harvard.edu/press/kits/perseus/blackhole_sound.html
Knowing the speed of sound plus the measured distance between waves allowed the scientists to estimate the interval between waves at just under 10 million years, corresponding to a frequency of about one cycle per 300 million million seconds,
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A bit lower than 10Hz, too.
There's nowhere I can't reach.