If G is the gravitational constant and M the mass of a body whose radius is R, the escape velocity is.In the case of a black hole, this velocity is equal to c the speed of light,hence the Schwarzschild radius of a black hole is expressed asEverything which could happen beyond the horizon is trapped, and can only increase the mass of the black hole.Contraty to Hollywood movies, a black hole is not a cosmic vacuum cleaner : it can only catch objects which come very near. If we replacedthe Sun with a black hole, we couldnt notice the difference (at least in terms of gravity, we would miss the heat !)We can view two scenarios to explain the creation of a black hole :*.a neutron star is part of a binary system, and its mass increases by the pulling of the matter of the otherstar -accretion diskphenomenon, like anova.*.the collapse of ahypernovaleads to the direct formation of a black hole.It must be said that some people, with supporting arguments, think that a black hole is physically impossible.All the theory about black holes must be considered with the utmost care, by keeping in mind the fact that its only a mathematical theory, at the moment, but whose physical reality is becoming more and more obvious.
Posted on: Sun, 10 Aug 2014 08:31:03 +0000
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