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event horizon
event horizon The surface of a black hole. For a non-rotating black hole, it is a spherical boundary at the black hole's Schwarzschild radius where the escape velocity becomes equal to the speed of light, so no events occurring within it can be seen from outside. However, the effects of the black hole's powerful gravitational field can still be felt outside the event horizon. For a rotating black hole, the event horizon is elliptical (see Kerr Black Hole).
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"event horizon." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "event horizon." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-eventhorizon.html "event horizon." A Dictionary of Astronomy. 1997. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-eventhorizon.html |
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event horizon
event horizon Boundary of a black hole, from which nothing can escape. Observers outside the event horizon can therefore obtain no information about the black hole's interior. The radius of the event horizon is called the Schwarzschild radius. At the event horizon, the escape velocity equals the velocity of light with the consequence that all electromagnetic radiation is trapped. Its presence can only be detected by its powerful gravitational force.
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"event horizon." World Encyclopedia. 2005. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "event horizon." World Encyclopedia. 2005. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O142-eventhorizon.html "event horizon." World Encyclopedia. 2005. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-eventhorizon.html |
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event horizon
e·vent ho·ri·zon • n. Astron. a theoretical boundary around a black hole beyond which no light or other radiation can escape. ∎ fig. any point of no return: we're nearing the event horizon of the presidential election. |
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"event horizon." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "event horizon." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O999-eventhorizon.html "event horizon." The Oxford Pocket Dictionary of Current English. 2009. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-eventhorizon.html |
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