What type of waves did Poincaré first propose in 1905?
Gravitational waves
Electromagnetic waves
Sound waves
Water waves
Answer
In 1905, Henri Poincaré first proposed the existence of gravitational waves, which are disturbances in the curvature of spacetime that propagate at the speed of light. These waves are caused by accelerating masses and are an important concept in Theory of general relativity.
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