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MIT Kavli Institute
The Sound of Gravity
As her hand slips from his grip, Patrick's life is shattered, forever changed. Trapped high on a mountain face during the worst storm in living memory, a young man is forced to fight the brutal winter for his life—moments after his beloved wife is swept away forever across the ice. Haunted by grief and guilt, Patrick keeps vigil on the mountain for 25 years, in the hope that one day it will release his devastating secret. Read more Read less click to open popover Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. To get the free app, enter your mobile phone number. Read more Read less. Enter your mobile number or email address below and we'll send you a link to download the free Kindle App.
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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?
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 animation ends by playing the original frequencies again twice. As the black holes spiral closer and closer in together, the frequency of the gravitational waves increases. Scientists call these sounds "chirps," because some events that generate gravitation waves would sound like a bird's chirp. National Science Foundation.