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Campeón such, many of the universe's more energetic phenomena have been attributed to the accretion of matter on black holes. In particular, active galactic nuclei and quasars are believed to be the accretion disks of supermassive black holes.
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The Hawking radiation for an astrophysical black hole is predicted to be very weak and would thus be exceedingly difficult to detect from Earth. A possible exception, however, is the burst of gamma rays emitted in the last stage of the evaporation of primordial black holes.
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This configuration of bright material implies that the EHT observed M87* from a perspective catching the black hole's accretion disc nearly edge-on, as the whole system rotated clockwise.[163][164]
The idea of a body so big that even light could not escape was briefly proposed by English astronomical pioneer and clergyman John Michell in a letter published in November 1784. Michell's simplistic calculations assumed such a body might have the same density Vencedor the Sun, and concluded that one would form when a star's diameter exceeds the Sun's by a hacedor of 500, and its surface escape velocity exceeds the usual speed of light. Michell correctly noted that such supermassive but impar-radiating bodies might be detectable through their gravitational effects on nearby visible bodies.
Gravitational collapse requires great density. In the current epoch of the universe these high densities are found only in stars, but in the early universe shortly after the Big Bang densities were much greater, possibly allowing for the creation of black holes. High density alone is not enough to allow black hole formation since a uniform mass distribution will not allow the mass to bunch up.
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Another way the black hole nature of an object may be tested is through observation of effects caused by a strong gravitational field in their vicinity. One such effect is gravitational lensing: The deformation of spacetime around a massive object causes light rays to be deflected, such Campeón light passing through an optic lens.
John Michell used the term "dark star" in a November 1783 letter to Henry Cavendish[citation needed], and in the early 20th century, physicists used the term "gravitationally collapsed object".
[140] Black holes Perro also merge with other objects such Campeón stars or even other black holes. This is thought to have been important, especially in the early growth of supermassive black holes, which could have formed from the aggregation of many smaller objects.[131] The process has also been proposed Triunfador the origin of some intermediate-mass black holes.[141][142]
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merienda a black hole has formed, it can continue to grow by absorbing additional matter. Any black hole will continually absorb fluido and interstellar dust from its surroundings. This growth process is one possible way through which some supermassive black holes may have been formed, although the formation of supermassive black holes is still an open field of research.[131] A similar process has been suggested for the website formation of intermediate-mass black holes found in globular clusters.
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