Schwarzschild radius

The Schwarzschild radius or gravitational radius is a characteristic radius associated with every mass. The term is used in physics and astronomy, especially in the theory of gravitation, general relativity. It was found in 1916 by Karl Schwarzschild and results from his discovery of an exact solution for the gravitational field outside a static, spherically symmetric star (see Schwarzschild metric, which is a solution of the Einstein field equations).

See also

• black hole, a general survey

Classification of black holes by type:

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• Schwarzschild or static black hole
• rotating or Kerr black hole
• charged black hole or Newman black hole and Kerr-Newman black hole

A classification of black holes by mass:

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• micro black hole and extra-dimensional black hole
• primordial black hole, a hypothetical leftover of the Big Bang
• stellar black hole, which could either be a static black hole or a rotating black hole
• supermassive black hole, which could also either be a static black hole or a rotating black hole

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