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pdorange at pas-de-pub-merci.mac.com (Pierre-Alain Dorange): > Steven D'Aprano <steve at pearwood.info> wrote: >> China has just announced a new supercomputer that is so fast it can >> run an infinite loop in 3.7 seconds. > > Near a black hole 3.7 seconds can last an infinite time... Which phenomenon prevents a black hole from ever forming. Yet astronomers keep telling us they are all over the place. Oppenheimer and his co-authors interpreted the singularity at the boundary of the Schwarzschild radius as indicating that this was the boundary of a bubble in which time stopped. This is a valid point of view for external observers, but not for infalling observers. Because of this property, the collapsed stars were called "frozen stars", because an outside observer would see the surface of the star frozen in time at the instant where its collapse takes it inside the Schwarzschild radius. <URL: https://en.wikipedia.org/wiki/Black_hole> Note that the "valid point of view for external observers" is the only valid scientific point of view. Marko

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