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1. Dictionary

   event horizon

   noun

   • 1. a notional boundary around a black hole beyond which no light or other radiation can escape.
   • ▪ a point of no return: "we're nearing the event horizon of the presidential election"

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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] At that time, the Newtonian theory of gravitation and the ...

3. Videos

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     What Happens at the Event Horizon? | Space Time | PBS Digital Studios

     8 Dec 2016

     3.1M views

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     1:49

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     What is the Event Horizon Telescope?

     10 Apr 2019

     71.9K views

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     EVENT HORIZON Story & Ending Explained

     27 Oct 2018

     474.5K views

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

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   Jun 1, 2024 · An event horizon is the boundary of a black hole where the escape velocity is equal to the speed of light. Learn how event horizons are calculated, how they differ for rotating and nonrotating black holes, and how they relate to Hawking radiation.

   • Author: The Editors of Encyclopaedia Britannica

5. 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 black hole ...

6. sentinelmission.org › event-horizonEvent Horizon - Definition & Detailed Explanation ...

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   Apr 30, 2024 · An event horizon is a boundary in spacetime beyond which events cannot affect an observer. Learn how event horizons are formed, what happens at them, and how they are studied in astrophysics.

7. www.nasa.gov › universe › what-are-black-holesWhat Are Black Holes? - NASA

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   Sep 8, 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.

8. www.merriam-webster.com › dictionary › event horizonEvent horizon Definition & Meaning - Merriam-Webster

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   May 31, 2024 · Learn the meaning of event horizon, the surface of a black hole beyond which nothing can escape. See how the word is used in sentences and explore its history and related articles.

9. People also ask

   What is an event horizon?

   • You’ll often read that the event horizon is where the escape velocity is c, the speed of light; that’s a not-too-bad description, but it’s better to say that the path of any ray of light, inside the event horizon, can never make it beyond that horizon.

   What is an Event Horizon? - Universe Today

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   What happens at the event horizon?

   • As the object collapses, its gravitational pull becomes stronger, eventually reaching a point where the escape velocity exceeds the speed of light. This critical point is known as the event horizon, beyond which nothing can escape. III.

   Event Horizon - Definition & Detailed Explanation - Astrophysics

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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

   en.wikipedia.org/wiki/Event_horizon

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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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10. www.universetoday.com › 42471What is an Event Horizon? - Universe Today

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    Oct 13, 2009 · An event horizon is the boundary between the inside and outside of a black hole, where light cannot escape. Learn how the Event Horizon Telescope captured the first image of a black hole's shadow, and what Einstein's theory predicts about event horizons.