Do black holes have centers? If so, what’s going on in there? Richard LivitskiSeal Beach, California Einstein spent 10 years wrestling with three fundamental concepts in physics: acceleration, the special theory of relativity, and the gravitational force. This heroic effort culminated in 1915 with the general theory of relativity, an elegant set of equations relatingContinue reading "What happens at the center of a black hole?"
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