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In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer. Wolfgang Rindler coined the term in the 1950s. In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape.
Há 5 dias · The event horizon is the boundary of a black hole where the escape velocity equals the speed of light. Nothing can escape or be observed from inside the event horizon, which is not a material surface but a mathematical demarcation.
- The Editors of Encyclopaedia Britannica
3 de mar. de 2023 · The event horizon is the spherical outer boundary of a black hole loosely considered to be its "surface." It is the point, according to NASA, that the gravitational...
8 de set. de 2020 · An event horizon is the boundary where the velocity needed to escape a black hole exceeds the speed of light. Learn how black holes are formed, classified, observed and studied by NASA.
30 de abr. de 2024 · An event horizon is a boundary in spacetime beyond which events cannot affect an observer. It is most commonly associated with black holes, where the gravitational pull is so strong that not even light can escape.
An event horizon is the outer edge of a black hole, beyond which nothing, including light, can escape. Learn more about the physics concept, its history, and how to use it in sentences with Cambridge Dictionary.
The event horizon captures any light passing through it, and the distorted space-time around it causes light to be redirected through gravitational lensing. These two effects produce a dark zone that astronomers refer to as the event horizon shadow, which is roughly twice as big as the black hole’s actual surface.
