Schwarzschild radius

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What Wikipedia says

The Schwarzschild radius is a parameter in the Schwarzschild solution to Einstein's field equations that corresponds to the radius of a sphere in flat space that has the same surface area as that of the event horizon of a Schwarzschild black hole of a given mass.

Excerpt from the Wikipedia article “Schwarzschild radius”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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