from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The region, usually described as spherical, marking the outer boundary of a black hole, inside which the gravitational force is strong enough to prevent matter or radiation from escaping.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light, causing time to practically stop.
- n. A point of no return, by analogy to the astronomical usage
from the GNU version of the Collaborative International Dictionary of English
- n. the boundary surface surrounding a black hole, from outside of which nothing inside can be observed, because nothing inside that surface, even light, can escape beyond it. See also black hole and escape velocity.
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