Schwarzschild radius

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Schwarz·schild radius

 (shwôrts′chīld′, shvärts′shĭld)
The radius of a collapsing celestial object at which gravitational forces require an escape velocity that exceeds the velocity of light, resulting in a black hole.

[After Karl Schwarzschild (1873-1916), German astronomer.]

Schwarzschild radius

(ˈʃwɔːtsˌʃɪld; German ˈʃvartsʃɪlt)
(Astronomy) astronomy the radius of a sphere (Schwarzschild sphere) surrounding a non-rotating uncharged black hole, from within which no information can escape because of gravitational forces
[C20: named after Karl Schwarzschild (1873–1916), US astrophysicist]
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