The event horizon of a black hole is a threshold around the black hole where the escape velocity surpasses the speed of light. It is also referred to as a boundary beyond which events cannot affect an observer.
Detailed Definition:
The term event horizon is used to describe the phenomena of a very strong gravitational pull in the vicinity of a massive and compact object, which is able to prevent even light from escaping. The escape velocity is a threshold value for which the event horizon occurs. It is the velocity needed for an object to overcome the forces acting due to the presence of an enormous mass. If it is greater than the speed of light, it is impossible to witness any event taking place past the event horizon.
Etymology:
The term was first used by Wolfgang Rindler in the 1950s.
Sample Sentence(s):
"The event horizon is the ultimate prison wall - one can get in but never get out."
- Avi Loeb, chair of astronomy at Harvard University.
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