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Einstein then wrote a series of papers applying relativity to gravity using the mathematics of Riemannian Geometry, contributing to [[General Relativity]]. Much of the actual mathematics of general relativity was worked out by Marcel Grossman, [[David Hilbert]], and others. Einstein's main contribution was to give an alternate derivation of the field equations, and to apply them to explain an [[anomaly]] in the advance of the perihelion in Mercury's orbit.

Einstein then wrote a series of papers applying relativity to gravity using the mathematics of Riemannian Geometry, contributing to [[General Relativity]]. Much of the actual mathematics of general relativity was worked out by Marcel Grossman, [[David Hilbert]], and others. Einstein's main contribution was to give an alternate derivation of the field equations, and to apply them to explain an [[anomaly]] in the advance of the perihelion in Mercury's orbit.

Arthur Eddington popularized General Relativity by publishing an explanation of it and by attempting to prove the theory experimentally in a dramatic test.  Eddington embarked on a highly publicized trip into the Atlantic Ocean off Africa in order to observe the bending of [[star]]light passing nearby the [[Sun]] during the total [[solar eclipse]] of May 29, 1919.  Eddington returned with a declaration that he had proven Einstein's theory of [[General Relativity]], making Einstein extremely famous<ref>On November 8, 1919, for example, the ''London Times'' had an article headlined: "The Revolution In Science/Einstein Versus Newton." Two days later, ''The New York Times''' headlines read: "Lights All Askew In The Heavens/Men Of Science More Or Less Agog Over Results Of Eclipse Observations/Einstein Theory Triumphs." [http://www.pbs.org/wgbh/nova/einstein/relativity/]</ref>, when in fact he had selectively used data to attain this result.  No Nobel Prize was given for relativity.

Arthur Eddington popularized General Relativity by publishing an explanation of it and by attempting to prove the theory experimentally in a dramatic test.  Eddington embarked on a highly publicized trip into the Atlantic Ocean off Africa in order to observe the bending of [[star]]light passing nearby the [[Sun]] during the total [[solar eclipse]] of May 29, 1919.  Eddington returned with a declaration that he had proven Einstein's theory of [[General Relativity]], making Einstein extremely famous<ref>Lightman, Alan (September 9, 1997).  [http://www.pbs.org/wgbh/nova/einstein/relativity/ "Relativity and the cosmos"].  PBS.org/WGBH/Nova.  Retrieved on January 24, 2015.  "On November 8, 1919, for example, the ''London Times'' had an article headlined: 'The Revolution In Science/Einstein Versus Newton.' Two days later, ''The New York Times''' headlines read: 'Lights All Askew In The Heavens/Men Of Science More Or Less Agog Over Results Of Eclipse Observations/Einstein Theory Triumphs.'"</ref>, when in fact he had selectively used data to attain this result.  No Nobel Prize was given for relativity.

In April 2004, NASA launched the satellite Gravity Probe B to test general relativity. The main purpose was to test relativistic frame dragging, but the results have been inconclusive.

In April 2004, NASA launched the satellite Gravity Probe B to test general relativity. The main purpose was to test relativistic frame dragging, but the results have been inconclusive.