In Current Science:
Schwarzschild radius is the radius of the Schwarzschild sphere. The Schwarzschild sphere is the effective boundary or horizon of a Schwarzschild black hole, which infalling matter reaches in an infinite time as seen by an external observer but a finite time in the reference frame of the matter, and at which the escape velocity is infinite, so that the escape of matter or radiation from the inside is impossible except by some quantum-mechanical process.
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