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The gravitational waves recorded by the collision of two black holes turned into sound waves, as can be heard in this video. On September 14, 2015, the LIGO Observatory detected gravitational waves from the merger of two black holes, with each having 30 times the mass of our sun. The incredibly strong collision lasted only for milliseconds.
The first two reproductions, the frequencies of sound waves with frequencies precisely matched the gravitational waves. In the other two iterations has been converting sounds at higher frequencies that best match the range of human hearing. The video finishes playing the original frequencies again twice.