Albert Einsteinās greatest discovery is most likely the general theory of relativity. Two years after proposing the special theory of relativity in 1905, Einstein realized that special relativity did not account for gravity or acceleration. Einstein spent the next eight years dealing with that problem. In general relativity, which Einstein proposed in 1915, gravity is not a force acting at a distance but rather a curving of the fabric of space-time. The theory of general relativity explains gravitational waves, black holes, and the expansion of the universe.
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