Gravitational waves sent out from a pair of colliding black holes have been converted to sound waves, as heard in this animation. On September 14, , LIGO observed gravitational waves from the merger of two black holes, each about 30 times the mass of our sun. The incredibly powerful event, which released 50 times more energy than all the stars in the observable universe, lasted only fractions of a second. In the first two runs of the animation, the sound-wave frequencies exactly match the frequencies of the gravitational waves. The second two runs of the animation play the sounds again at higher frequencies that better fit the human hearing range.
The Sound of Gravity
MIT Kavli Institute
Wherever you go, there are things in nature that you can see or things that you hear. For example, you see a rainbow. But why? Why does this happen?
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