Schwarzschild radius

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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History and Etymology for Schwarzschild radius

after Karl Schwarzschild †1916 German astronomer

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to move with a clumsy heavy tread

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