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1. www.britannica.com › topic › event-horizon-black-holeEvent horizon | Definition, Explanation, & Facts | Britannica

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   Sep 7, 2024 · Event horizon, boundary marking the limits of a black hole. At the event horizon, the escape velocity is equal to the speed of light. Since general relativity states that nothing can travel faster than the speed of light, nothing inside the event horizon can ever escape beyond it, including light.

   • Author: The Editors of Encyclopaedia Britannica

2. en.wikipedia.org › wiki › Event_horizonEvent horizon - Wikipedia

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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. [1] In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape. [2]

3. blog.prepscholar.com › ap-gov-vocab-termsThe 60 Most Important AP Gov Vocab Terms, Defined

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   This guide will help you get acquainted with 60 important AP Gov vocab terms you need to know. by dividing the terms up into key content areas that are assessed on the exam and providing straightforward definitions for each term.

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4. quizlet.com › 15687820 › ap-gov-chapter-7-vocabAP Gov Chapter 7 Vocab Flashcards - Quizlet

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   3 days ago · Book Definition: Events purposely staged for the media that nonetheless look spontaneous. In keeping with politics as theater, media events can be staged by individuals, groups, and government officials, especially presidents.

5. library.fiveable.me › event-horizonEvent Horizon - Vocab, Definition, and Must Know Facts - Fiveable

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   Definition. The event horizon is the boundary surrounding a black hole beyond which no information or matter can escape. It represents the point of no return, where the gravitational pull becomes so strong that escape velocity exceeds the speed of light, making it impossible for anything that crosses this threshold to return.

6. quizlet.com › 329798274 › ap-government-chapter-12AP Government Chapter 12 Vocab Flashcards - Quizlet

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   Study with Quizlet and memorize flashcards containing terms like Legitimacy, Referendum, initiative petition and more.

7. People also ask

   What is event horizon in physics?

   • event horizon, boundary marking the limits of a black hole. At the event horizon, the escape velocity is equal to the speed of light. Since general relativity states that nothing can travel faster than the speed of light, nothing inside the event horizon can ever cross the boundary and escape beyond it, including light.

   Event horizon | Definition, Explanation, & Facts | Britannica

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   What is an example of an event horizon?

   • One of the best-known examples of an event horizon derives from general relativity's description of a black hole, a celestial object so dense that no nearby matter or radiation can escape its gravitational field. Often, this is described as the boundary within which the black hole's escape velocity is greater than the speed of light.

   Event horizon - Wikipedia

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   Are event horizons a global feature?

   • If you are at some point xμ x μ in spacetime, and you need to know properties of the spacetime non-local to xμ x μ in order to infer property X X, then X X is a global feature of the spacetime. Thus, event horizons are a global feature of your geometry.

   What does it mean that the event horizon is a global concept?

   physics.stackexchange.com/questions/560580/what-does-it-mean-that-the-event-horizon-is-a-global-concept

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   What is an apparent horizon?

   • Under these conditions, an apparent horizon is present in the particle's (accelerating) reference frame, representing a boundary beyond which events are unobservable. For example, this occurs with a uniformly accelerated particle. A spacetime diagram of this situation is shown in the figure to the right.

   Event horizon - Wikipedia

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   What is event horizon in cosmology?

   • In cosmology, the event horizon of the observable universe is the largest comoving distance from which light emitted now can ever reach the observer in the future. This differs from the concept of the particle horizon, which represents the largest comoving distance from which light emitted in the past could reach the observer at a given time.

   Event horizon - Wikipedia

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   How do event horizons work?

   • In practice, all event horizons appear to be some distance away from any observer, and objects sent towards an event horizon never appear to cross it from the sending observer's point of view (as the horizon-crossing event's light cone never intersects the observer's world line).

   Event horizon - Wikipedia

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8. physics.stackexchange.com › questions › 560580What does it mean that the event horizon is a global concept?

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   Jun 20, 2020 · If you are at some point xμ x μ in spacetime, and you need to know properties of the spacetime non-local to xμ x μ in order to infer property X X, then X X is a global feature of the spacetime. Thus, event horizons are a global feature of your geometry.