Colliding black holes create gravitational waves from "summary" of The Fabric of the Cosmos by Brian Greene
When two black holes spiral towards each other, their immense gravitational pull distorts the fabric of spacetime, causing ripples known as gravitational waves. These waves travel at the speed of light, carrying information about the cataclysmic event that created them. As the black holes merge, they release a burst of gravitational waves, which spread outwards like the ripples on a pond after a stone is thrown in. Einstein's general theory of relativity predicted the existence of gravitational waves over a century ago, but it wasn't until 2015 that scientists were able to detect them directly. By using incredibly sensitive instruments called interferometers, researchers were able to observe the faint signals of gravitational waves passing through the Earth. This groundbreaking discovery confirmed Einstein's theory and opened up a new window into the study of the cosm...
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