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Schwarzschild radius
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Schwarzschild radius

In astrophysics, the radius of the event horizon surrounding a black hole. Light originating within the event horizon cannot escape the black hole's gravitational pull.

For a black hole of mass m, the Schwarzschild radius RS is given by RS = 2Gm/c2, where G is the universal gravitational constant and c is the speed of light. The Schwarzschild radius for a black hole of solar mass is about 3 km/1.9 mi. It is named after Karl Schwarzschild, the German astronomer who deduced the possibility of black holes from Einstein's general theory of relativity in 1916.
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