For instance, postulate 2 explains the results of the MichelsonвЂ“Morley experiment. The resultant theory copes with experiment better than classical mechanics. The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the motion of the light source.

The laws of physics are the same for all observers in any inertial frame of reference relative to one another ( principle of relativity).Special relativity is based on two postulates which are contradictory in classical mechanics: It was introduced in Einstein's 1905 paper ' On the Electrodynamics of Moving Bodies' (for the contributions of many other physicists see History of special relativity). Special relativity is a theory of the structure of spacetime. As astronomical phenomena were discovered, such as quasars (1963), the 3-kelvin microwave background radiation (1965), pulsars (1967), and the first black hole candidates (1981), the theory explained their attributes, and measurement of them further confirmed the theory. New mathematical techniques to apply to general relativity streamlined calculations and made its concepts more easily visualized. Around 1960, general relativity became central to physics and astronomy. Its mathematics seemed difficult and fully understandable only by a small number of people. It seemed to offer little potential for experimental test, as most of its assertions were on an astronomical scale. It rapidly became a significant and necessary tool for theorists and experimentalists in the new fields of atomic physics, nuclear physics, and quantum mechanics.Д«y comparison, general relativity did not appear to be as useful, beyond making minor corrections to predictions of Newtonian gravitation theory.

Д«y the 1920s, the physics community understood and accepted special relativity. In the discussion section of the same paper, Alfred Bucherer used for the first time the expression 'theory of relativity' ( German: RelativitГ¤tstheorie). The term 'theory of relativity' was based on the expression 'relative theory' ( German: Relativtheorie) used in 1906 by Planck, who emphasized how the theory uses the principle of relativity. The final form of general relativity was published in 1916. Max Planck, Hermann Minkowski and others did subsequent work.Д®instein developed general relativity between 19, with contributions by many others after 1915. Michelson, Hendrik Lorentz, Henri PoincarГ© and others. ДЄlbert Einstein published the theory of special relativity in 1905, building on many theoretical results and empirical findings obtained by Albert A. With relativity, cosmology and astrophysics predicted extraordinary astronomical phenomena such as neutron stars, black holes, and gravitational waves. In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. It introduced concepts including 4- dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It applies to the cosmological and astrophysical realm, including astronomy. General relativity explains the law of gravitation and its relation to other forces of nature. Special relativity applies to all physical phenomena in the absence of gravity. The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity, proposed and published in 19, respectively. Video simulation the merger of GW150914, showing the spacetime distortion from gravity as the black holes orbit and merge

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