R HURT - CALTECH / JPL / NASA / SCIENCE PHOTO LIBRARY R HURT - CALTECH / JPL / NASA / SCIENCE PHOTO LIBRARY
Animation of gravitational waves emanating from a pair of closely-orbiting neutron stars. Gravitational waves are theorised to carry gravitational energy at the speed of light. They would be produced in relatively large quantities by dense objects in close, fast orbits, like this. They were predicted by Einstein in 1916, and remained undetected for a century.
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