According to New York Times, a team of scientists recently announced that they've heard and recorded the sound of two black holes colliding a billion light-years away, a fleeting chirp that fulfilled the last prediction of Einstein’s general theory of relativity.
These chirps are gravitational waves converted to audible sounds. The faint thump matches the gravitational waves’ frequencies. The louder chirp is a higher frequency better suited to human ears. - LIGO.
That faint rising tone, physicists say, is the first direct evidence of gravitational waves, the ripples in the fabric of space-time that Einstein predicted a century ago.
LIGO’s detectors measured their first vibrations from a gravitational wave. Translated to sound, it was a short chirp, the billion-year-old echo of the collision of those two black holes.
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