One of NASA’s observatories has discovered a giant black hole that hums. Located in the Perseus cluster of galaxies about 250 million light years from Earth, the black hole vibrates at the frequency of a B flat. But it is too low a pitch to be picked up by the human ear. Scientific instruments have placed the note at 57 octaves below middle C on a piano.
via Our Daily Bread http://feedproxy.google.com/~r/odb/feed/~3/GhyjAnEHt7c/
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