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Are black holes spherical? If so, does a black hole's singularity sit at the center of a surrounding event horizon "shell"?

Bob Brown, Cooperstown, Pennsylvania
RELATED TOPICS: BLACK HOLES
Black hole

In 1916, Karl Schwarzschild calculated the simplest type of black hole: a central singularity surrounded by a spherical event horizon whose size is proportional to the black hole’s mass. (Anything, even light, that crosses the “event horizon” cannot escape.) In addition to mass, electric charge and spin are the only other properties a black hole can have.

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