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Einstein then wrote a series of papers applying relativity to gravity using the mathematics of Riemannian Geometry, resulting in [[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, resulting in [[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, 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, when in fact he had selectively used data to attain this result. No Nobel Prize was given for relativity.
In April 2007, NASA reported early results from their satellite Gravity Probe B, confirming 'to a precision of better than 1 per cent' Einstein's assertion that large objects such as the Earth distort the fabric of space and time.<ref> http://observer.guardian.co.uk/uk_news/story/0,,2057529,00.html</ref> The Gravity Probe B project, a joint mission between Nasa and Stanford University, used the most precise gyroscopes ever manufactured to detect minute distortions in the fabric of the universe.
Einstein compared the effects of large objects on space and time to the way that a large ball placed on a sheet of rubber stretches the material and causes it to sag, and drew the analogy with the way stars and planets warp space-time. A smaller ball rolling along the sagging fabric will be drawn towards the larger ball, in the same way that the Earth is drawn towards the sun, but will not fall into it as long as it continues to move at sufficient speed. This was a change in thinking from the Newtonian cosmos, in which gravity was viewed purely as an attractive force between bodies.
Robert Massey of the Royal Astronomical Society said: 'From the most esoteric aspects of time dilation through to the beautiful and simple equation, E=mc², the vast bulk of Einstein's ideas about the universe are standing up to the test of time,'
==Cosmological Constant==
==Cosmological Constant==
==References==
==References==
<references/>
*"The Nobel Prize in Physics 1921"[http://nobelprize.org/nobel_prizes/physics/laureates/1921/]
*"The Nobel Prize in Physics 1921"[http://nobelprize.org/nobel_prizes/physics/laureates/1921/]
*"On The Electrodynamics Of Moving Bodies"[http://www.fourmilab.ch/etexts/einstein/specrel/specrel.pdf]
*"On The Electrodynamics Of Moving Bodies"[http://www.fourmilab.ch/etexts/einstein/specrel/specrel.pdf]