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Einsteins Theory of Relativity was first developed in 1905. His theory has been developed into two different stages. The first stage of the theory is the "Special Theory" and the second stage is the "General Theory”. Each portion of the theory holds significant and factual information about Einstein’s concept of the Theory of relativity.
 * Einstein’s theory of relativity is the fundamental unity between matter and energy,space and time as well as the force of gravity and acceleration.

Relativity, http://encarta.msn.com/media_461535824_761558302_-1_1/Albert_Einstein.html   **
 * The Special Theory of Relativity implied that absolute motion did not exist. As Einstein had said “ no particular object in the universe is suitable as an absolute frame of reference that is at rest with respect to space. Any object (such as the center of the solar system) is a suitable frame of reference, and the motion of any object can be referred to that frame . ” (//Bornstein// sct.3) Einstein stated that movement was due to the motion of the earth on its axis and the revolutions that it took around the sun. He believed that all motion was considered to be relative. In the Special Theory of Relativity Einstein also brings up the point of being at rest. Einstein helps to prove his points on absolute rest by performing the Michelson-Morley experiment.

In The Special Theory of Relativity Einstein preformed experiments on the electron that helped him lead to the assumption that radioactive substances have a speed that is very much similar to the speed of light. The electron theory was confirmed by the world renown equation of E= //mc//^2. He also verified his theory by performing experiments on light in moving water’s velocity and on the magnetic forces in moving substances. In the Special Theory of Relativity Einstein stated that “Every particle or object in the universe is described by a so-called world line that describes its position in time and space.” ( //Bornstein// 3) He also stated that “**** The “distance” or “interval” between any two events can be accurately described by means of a combination of space and time, but not by either of these separately.”(//Bornstein// 3) The General Theory of Relativity implied that objects would accelerate with the respects of one another. Einstein developed this theory by explaining the differences between the law of relativity and the law of gravity. To balance out the differences he introduced the principle of equivalence. As Einstein has stated “The principle of equivalence holds that forces produced by gravity are in every way equivalent to forces produced by acceleration, so that it is theoretically impossible to distinguish between gravitational and accelerational forces by experiment.” (//Bornstein// 3) Einstein used the example of an astronaut standing stationary in a rocket ship as it launched as an example to prove his theory of gravity and acceleration.

 Einstein’s theory of relativity is one of the most complex yet most simplistic concepts of physics. His theory of fundamental unity between matter and energy, space and time, as well as the force of gravity and acceleration has created firm base for many laws of physics in which we use today.**

Work Cited:

Bornstein, Lawrence A. "Relativity." __MSN Encarta__. 2008. Microsoft Encarta Online. 6 Feb. 2009 < http://encarta.msn.com/encyclopedia_761558302/Relativity.html>.

This website has many different breakdowns of information about the theory of relativity located on it. This website is a reliable source because the author Lawrence A. Bornstein has a Ph.D and an M.S. This website also includes a work cited page of its own and has passed the website evaluation.

"Relativity." __Encyclopaedia Britannica__. 2009. Encyclopaedia Britannica Online. 7 Feb. 2009 .

This website thoroughly explains Einsteins theory of relativity in more simpler terms. This website is a reliable source because because it has come from an online encyclopedia. This website also includes a work cited page of its own and has passed the website evaluation.