What Is A Black Hole?

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What is a black hole? In simple terms, a black hole is a visually undetectable region of space that exerts a gravitational force so powerful that not even light can escape [Wald 1984, pp. 299–300], thus exhibiting the characteristics of an ideal black body in the sense that it absorbs all the radiation that falls on it [Schutz, Bernard F. (2003). Gravity from the ground up. Cambridge University Press. p. 110]. In addition, all black holes are enveloped by spherical “boundaries” known as “event horizons”, which defines a point from beyond which it is impossible to escape once it is crossed. One notable feature of event horizons is the fact that they seem to radiate Hawking radiation, a form of radiation predicted by Steven Hawking, that…show more content…
Nonetheless, if the remnant is more massive than about three to four solar masses, a condition that satisfies the Tolman–Oppenheimer–Volkoff limit [Oppenheimer, J. R.; Volkoff, G. M. (1939). "On Massive Neutron Cores". Physical Review 55 (4): 374–381], there is no known process that will prevent the remnant from contracting into a black hole [Carroll 2004, Section 5.8], although it is thought that quark degeneracy pressure may be able to do so in cases where the mass of the remnant equals, or nearly equals three solar masses, but there exists no empirical research or evidence to support this view. History of black holes. Contrary to popular belief, black holes were not the invention of Steven Hawking or Albert Einstein. Although Einstein first predicted the existence of black holes in his General Theory of Relativity as early as 1919, the idea that something could collapse to a point from which even light could not escape was first proposed by John Michell in 1783 in a communication to Henry Cavendish, who was a member of the Royal Society, and in the following terms: “If the semi-diameter of a sphere of the same density as the Sun were to exceed that of the Sun in the proportion of 500 to 1, a body falling from an infinite height towards it would have acquired at its surface greater velocity than that of light, and consequently supposing light to be attracted by the same force in proportion to its vis inertiae, with other
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