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Schwarzschild radius

A Dictionary of Astronomy | 1997 | 401 words | Copyright

Schwarzschild radius The radius of the event horizon of a black hole. At the Schwarzschild radius the escape velocity becomes equal to the speed of light. The more massive the black hole, the larger the Schwarzschild radius. For a body of mass M the Schwarzschild radius is 2GM/c2, where G is the gravitational constant and c is the speed of light. It was first calculated in 1916 by K.Schwarzschild.

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