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Schwarzschild radius

Schwarzs·child ra·di·us [ shwáwrts chld ràydee əss, shvrts shìlt ràydee əss ]


noun 
Definition:
 
radius around black hole: the critical radius within which the gravitational force of a gravitationally collapsing astronomical object becomes so great that neither matter nor energy can escape, creating a black hole

[Mid-20th century. After Karl Schwarzschild (1873-1916), German astronomer]
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