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[[File:BlackHole.jpg|none|100px|An artist's impression of an accretion disc of a black hole]] |
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⚫ | A '''[[black hole]]''' is a [[theory|theoretical]] concentration of [[mass]] with a [[gravitational field]] so strong that its [[escape velocity]] exceeds the [[speed of light]]. This implies that nothing, not even [[light]], can escape its [[gravity]], hence the word "black". The term "black hole" is widespread, even though the theory does not refer to any hole in the usual sense. According to [[general relativity|classical general relativity]], no [[matter]] or [[information]] can flow from the interior of a black hole to an outside observer, although quantum mechanics may allow deviations from this strict rule. The existence of black holes in the universe is well-supported both theoretically and by astronomical observation; however, a minority of physicists dissent. ('''[[black hole|more...]]''') |
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⚫ | A '''[[black hole]]''' is a [[theory|theoretical]] concentration of [[mass]] with a [[gravitational field]] so strong that its [[escape velocity]] exceeds the [[speed of light]]. This implies that nothing, not even [[light]], can escape its [[gravity]], hence the word "black". The term "black hole" is widespread, even though the theory does not refer to any hole in the usual sense. According to [[general relativity|classical general relativity]], no [[matter]] or [[information]] can flow from the interior of a black hole to an outside observer, although quantum mechanics may allow deviations from this strict rule. The existence of black holes in the universe is well-supported both theoretically and by astronomical observation; however, a minority of physicists dissent. |
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{{TFAfooter|Month=September|Year=2004}} |
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'''[[Wikipedia:Today's featured article/September 2004|Archive]]''' – '''[[mail:daily-article-l|By email]]''' – '''[[Wikipedia:Featured articles|More featured articles]]''' |
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Latest revision as of 23:49, 7 January 2009
A black hole is a theoretical concentration of mass with a gravitational field so strong that its escape velocity exceeds the speed of light. This implies that nothing, not even light, can escape its gravity, hence the word "black". The term "black hole" is widespread, even though the theory does not refer to any hole in the usual sense. According to classical general relativity, no matter or information can flow from the interior of a black hole to an outside observer, although quantum mechanics may allow deviations from this strict rule. The existence of black holes in the universe is well-supported both theoretically and by astronomical observation; however, a minority of physicists dissent. (more...)
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