A black...
A black hole (typically between 3 and 10 solar masses) that forms when a massive star explodes and leaves behind a small, heavy core which collapses on itself if it has enough mass
A black hole with no electric charge and no angular-momentum (which means it is non-rotating) that has an event horizon radius determined solely by its mass; The Schwarzschild metric describes such a black hole and was worked out by Karl Schwarzschild (and independently by Johannes Droste) in 1916
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