Schwarzschild radius
noun
Schwarz·schild radius
ˈshwȯrtˌshild-,
ˈs(h)wȯrtsˌchīld-;
ˈshvärtˌshilt-
: 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
Word History
Etymology
after Karl Schwarzschild †1916 German astronomer
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