1. Theories of Black Holes
... . Why black? Though the history of the term is interesting, the main reason is that no light can escape from inside a black hole: it has, in effect, disappeared from the visible universe. By definition a black hole is a region where matter collapses to infinite density and where, as a result, the curvature of spacetime is extreme. Moreover, the intense gravitational field of the black hole prevents any ... light or other electromagnetic radiation from escaping. But where lies the "point of no return" at which any matter or energy ... complete unified theory that will describe everything...
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