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Gravitational waves carry information about their dramatic origins and about the nature of gravity that cannot otherwise be obtained. It has been concluded that the detected gravitational waves were produced during the final fraction of a second of the merger of two black holes to produce a single, more massive spinning black hole. Such a collision of two black holes had been predicted but never observed.

On the History of the Michelson Experiment: A Personal Recollection (Gravitational Waves Detected 100 Years After Einstein's General Relativity)