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 * Theory Of Relativity

Einstein states that all observers will see light travel at the same speed no matter what frame you are in. Also laws of electomagnetism and magnetics are the same for all observers. There are two theorys of relativity special and general.(Wolfe)**

General relativity was the first major new theory of gravity since Newton 250 years earlier. General relativity was first published in 1915, which came after Einstein's theory of special relativity. Special relativity proposed that distance and time are not absolute.General relativity proposed that gravity, as well as motion, can affect the intervals of time and of space. The key idea of general relativity, called the equivalence principle, is that gravity pulling in one direction is completely equivalent to an acceleration in the opposite direction. General relativity has to deal with black holes and the universe as a whole. A black hole is a region of space whose attractive gravitational force is so intense that no matter, light, or communication of any kind can escape (Lightman). It is believed that black holes form from collapsed stars. Every star must eventually exhaust its nuclear fuel. When that occurs, its unbalanced self-gravitational attraction causes it to collapse. According to theory, if a burned-out star has a mass larger than about three times the mass of our sun, no amount of additional pressure can stave off total gravitational collapse. The star collapses to form a black hole (Lightman). Images from http://www.bartleby.com/173/  Lightman, Alan. "Relativity and the Cosmos." //Nova.// June 2005. PBS. 29 Jan 2009. http://www.pbs.org/wgbh/nova/einstein/relativity/ Annotation-This web site was chosen by many students in the class. The author was credible and all the information on the site was cited from exactly where ot came from.