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event horizon

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event horizon

 
Use event horizon in a Sentence
–noun Astronomy.
the boundary around a black hole on and within which no matter or radiation can escape.
Origin:
1970–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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event horizon  
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.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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