They were first proposed by Henri Poincaré in 1905 and subsequently predicted in 1916 by Albert Einstein on the basis of his general theory of relativity. Gravitational waves transport energy as gravitational radiation, a form of radiant energy similar to electromagnetic radiation.
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I appreciate a bit of history, although I find attribution to usually be a human weakness.
Poincare has impressed some of my youth with his theory on the conjecture and possible shapes of planets.