from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy The radius of an object such that, if all its
masswere compressed within that radius, the escape velocitywould equal the speed of light
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Karl Schwarzschild, (1873–1916), German astronomer.]
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