Now That's Deep

What is the sound of one black hole flapping?

| September 24, 2003

NASA's Chandra X-ray observatory recently discovered a B-flat flying through space at a wavelength 57 octaves below the middle note of a piano -- the deepest tone ever detected. Scientists are excited about this discovery because it potentially solves a mystery about why gas surrounding the Perseus galaxy cluster does not chill out as theory suggests it should. Since sound waves are slower and more physical in nature than visible light or radio waves, they physically compress air, water, or in this case, interstellar gas as they move through it. Thus, the sound waves heat gas as they move through it with an amount of energy equivalent to the explosion of 100 million stars. This musical production is in some sense no surprise to scientists; our own solar system, and even Earth, put out their own symphony of inaudible musical notes.
-- Joel Stonington

Go there>> Black Hole Strikes Deepest Musical Note Ever Heard