For a more comprehensive introduction to both Special and General Relativity, see the links at Relativity on the WWW, and The Light Cone (An Illuminating Introduction to Relativity), and Albert Einstein Online;
csep10.phys.utk.edu/astr161/lect/history/einstein.html csep10.phys.utk.edu/astr161/lect/history/einstein.html
Einstein's theory of General Relativity is a continuation or extension of Newton's law of gravity. Einstein's theory is not perfect (no scientific theory is absolutely perfect), but it does give a better understanding of the universe.
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However, we don't believe that can be correct because the Newton/Einstein form of the law is so successful in so many situations. In fact, we have direct confirmation on scales and conditions that are not wildly different from galaxy diameters that the law works very well.
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and one on his special theory of relativity, which included his formulation of the equivalence of mass and energy (E = mc2). Einstein held several professorships before becoming director of Berlin's Kaiser Wilhelm Institute for Physics in 1913. In 1915 he published his general theory of relativity,
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--- Axioms: -1st law of Einstein: The laws of nature remain unchanged in a reference axis system, and any other, given that these move with a linear speed in regard to each other --- -2nd law of Einstein: The velocity of light is a constant, independent of the direction in which ... Faqts : Science : Physics : Relativity :
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Einstein's Relativity differs from classical relativity, because of the way he looked at time. Before Einstein, people thought time to be absolute, which is to say that one big clock measures the time for the entire universe. ... The most dramatic consequences of this law are observed in nature, for example in nuclear...
www.thebigview.com/spacetime/relativity.html www.thebigview.com/spacetime/relativity.html
Special relativity - Wikipedia, the free encyclopedia
Special relativity (SR) (also known as the special theory of relativity or STR ) is the physical theory of measurement in inertial frames of reference proposed in 1905 by Albert Einstein (after t...
en.wikipedia.org/wiki/Special_relativity
Einstein's equations; Einstein's equivalency principle; Einstein's field equation; Einstein's field equations; Einstein's field equations; Einstein's general theory of relativity; Einstein's general theory of relativity; Einstein's general theory of relativity; Einstein's law of gravitation; Einstein's Little...
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Einstein's Special Theory of Relativity is valid for systems that are not accelerating. Since from Newton's second law an acceleration implies a force, special relativity is valid only when no forces act.
csep10.phys.utk.edu/astr162/lect/cosmology/gravity.html