单词	Schwarzschild radius
释义	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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