Gravitational wave: an intresting matter
Gravitational waves are ripples in the curvature of spacetime that propagate as waves, generated in certain gravitational interactions and travelling outward from their source. The possibility of gravitational waves was discussed in 1893 byHeaviside using the analogy between the inverse-square law in gravitation and electricity.[1] In 1905 Henri Poincare first predicted gravitational waves (ondes gravifiques) emanating from a body and propagating at the speed of light as being required by the formalism of spacetime.[2] Predicted in 1916[3][4] by Albert Einstein on the basis of his theory of general relativity,[5][6] gravitational waves transport energy as gravitational radiation, a form of radiant energy similar toelectromagnetic radiation.[7] Gravitational waves cannot exist in the Newtonian theory of gravitation, since Newtonian theory postulates that physical interactions propagate at infinite speed.
Gravitational-wave astronomy is an emerging branch of observational astronomy which aims to use gravitational waves to collect observational data about objects such as neutron stars and black holes, events such as supernovae, and processes including those of the early universe shortly after the Big Bang.
Various gravitational-wave observatories (detectors) are under construction or in operation, such as Advanced LIGO which began observations in September 2015.[8]
Potential sources of detectable gravitational waves include binary star systems composed of white dwarfs, neutron stars, and black holes. On February 11, 2016, the LIGO Scientific Collaboration and Virgo Collaboration teams announced that they had made thefirst observation of gravitational waves, originating from a pair of merging black holes using the Advanced LIGO detectors.[9][10][11]On June 15, 2016, a second detection of gravitational waves from coalescing black holes was announced.[12][13][14]
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