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Gravitational waves can distort spacetime from "summary" of The Science of Interstellar by Kip Thorne
Gravitational waves are ripples in the fabric of spacetime itself. Just as waves on the surface of a pond distort the water's surface, gravitational waves distort the very essence of space and time. These waves are produced by the most violent and energetic events in the universe, such as the collision of black holes or the explosion of massive stars. When gravitational waves pass through spacetime, they cause it to stretch and compress in a specific pattern. This stretching and compressing of spacetime can be visualized as the stretching and squeezing of a rubber sheet. As a gravitational wave passes through, it creates alternating regions of compression and stretching, much like the crests and troughs of a wave in the ocean. The distortion of spacetime by gravitation...
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