Definition: The event horizon is a boundary in general relativity beyond which events can't spread to affect outside observers. The most common case in physics where an event horizon comes up is in the context of a black hole, where it represents the point beyond which nothing - not even light - can escape from a black hole, due to the intense bending of the gravitational field.
Event horizon
By Andrew Zimmerman Jones, About.com Guide
Artistic rendering of a Black Hole
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