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event horizon

noun, Astronomy
1.
the boundary around a black hole on and within which no matter or radiation can escape.
Origin
1970-1975
1970-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for event horizon
  • And interest rates have reached the event horizon of zero.
  • So the region where the flow changes from subsonic to supersonic is an event horizon.
  • Once you cross the event horizon, you can never escape.
  • It would only have gravity due to the event horizon.
  • We also know time slows in a deep gravitational well and finally stops from our perspective at an event horizon.
  • The region around it where the escape velocity equals the speed of light is called the event horizon.
  • Surrounding the singularity is a spherical boundary called the event horizon.
  • He realised that if one of the pair were to cross the event horizon, it could never return.
  • It won't be too long before radio telescopes will be able to resolve the event horizon itself.
  • The event horizon is a paradox of strange behavior and anti-logic.
British Dictionary definitions for event horizon

event horizon

noun
1.
(astronomy) the surface around a black hole enclosing the space from which electromagnetic radiation cannot escape due to gravitational attraction. For a non-rotating black hole, the radius is proportional to the mass of the black hole
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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event horizon in Science
event horizon
  (ĭ-věnt')   
A spatial boundary around a black hole inside which gravity is strong enough to prevent all matter and radiation from escaping. The inability of even light to escape this region is what gives black holes their name.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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