A black hole binary star system called XTE J1550-564 has recently become one of the brightest sources in the x-ray sky. Astronomers are fascinated by fluctuations in the x-ray emission from this source, which if converted to sound waves would feel like the deep rumbling vibrations from a bass speaker at a rock 'n roll concert.
(i don't think this reporter has been inside a bass cabinet at a desert party yet... - @Om*)
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Humming Black Hole