General theory of relativity

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The general theory of relativity explains the phenomena of gravity as a an artifact of the geometry of space and time, which is not simply a Euclidean geometry but a Riemannian geometry that varies from location to location as it is affected by the presence of massive objects.^[1] The theory was proposed by Albert Einstein in 1915. An historical sketch of the theory and its experimental verification is found in the Introduction of Hughston and Tod.^[1] The work of Robert Pound provided the first experimental confirmation of the theory.

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