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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.

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2. www.oxfordreference.com › display › 10Event horizon - Oxford Reference

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   Oct 3, 2024 · Overview. event horizon. Quick Reference. The surface of a black hole. For a non-rotating black hole, it is a spherical boundary at the black hole's Schwarzschild radius where the escape velocity becomes equal to the speed of light, so no events occurring within it can be seen from outside.

3. www.space.com › black-holes-event-horizonWhat is a black hole event horizon (and what happens there)?

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   Mar 3, 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 influence of the...

4. phys.libretexts.org › Bookshelves › Relativity6.1: Event Horizons - Physics LibreTexts

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   Spacetime, as seen by an observer on the ship, has been divided by a curtain into two causally disconnected parts. This boundary is called an event horizon. Its existence is relative to the world-line of a particular observer. An observer who is not accelerating along with the ship does consider an event horizon to exist.

5. 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]

6. www.oxfordreference.com › abstract › 10Event horizon - Oxford Reference

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   An event horizon is a property of space-time, normally described by Albert Einstein's theory of general relativity. It separates the regions of space-time that we will be able to see (i.e. receive radiation from) from those that we never will. Event horizons arise in two main contexts, ...

7. People also ask

   What is the event horizon?

   • 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 influence of the black hole becomes so great that not even light is fast enough to escape it.

   What is a black hole event horizon (and what happens there)? - Space.c…

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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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   What is an event horizon in astrophysics?

   • 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.

   Event horizon - Wikipedia

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   What is a black hole event horizon?

   • In 1958, David Finkelstein used general relativity to introduce a stricter definition of a local black hole event horizon as a boundary beyond which events of any kind cannot affect an outside observer, leading to information and firewall paradoxes, encouraging the re-examination of the concept of local event horizons and the notion of black holes.

   Event horizon - Wikipedia

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   Can a black hole escape from the event horizon?

   • 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. Thus, nothing that enters a black hole can get out or can be observed from outside the event horizon.

   Event horizon | Definition, Explanation, & Facts | Britannica

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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. 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.