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Theory of relativity was discovered by physicist Albert Einstein. There are two parts of theory of relativity; one is special relativity and the other one is general relativity. Einstein theories also explains the behavior of mass, energy, gravity, time and space. When developing the theories of relativity, Einstein used some ideas from Galileo(Special Relativity,Stanford).

General relativity was discovered in 1915, and it explains that the force of two objects are continously despite the distance(Dine,NASA;Relativity). In the special theory of relativity, Einstein discovered nothing can travel faster at two points faster than the speed of light(Dine,NASA;Relativity). Einstein developed some ideas about theories of relativity from Galileo(Dine,NASA;Relativity).

The main difference of the general theory of relativity and the special theory of relativity is in how objects exerts from one another forces(Dine,NASA;Relativity).


 * This is an equation of energy which is involves in the theory of relativity:


 * Albert Einstein was the discoverer of the theory of relativity:

Dine, Michael. "Relativity." World Book Online Reference Center. 2004. World Book, Inc. http://www.worldbookonline.com/wb/Article?id=ar464240. "Special Relativity."Stanford University for the US Dept of Energy. 2008. http://www2.slac.stanford.edu/vvc/theory/relativity.html