SINCE 1828
Schwarzschild radius
noun
Schwarz·schild radius
| \ ˈshwȯrtˌshild-, ˈs(h)wȯrtsˌchīld-; ˈshvärtˌshilt-\
Definition of Schwarzschild radius
: the radius of the spherical boundary within which a given mass (as of a star) must collapse to become a black hole
also
: the distance of the event horizon from the center of a black hole
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