event horizon

noun

: the surface of a black hole : the boundary of a black hole beyond which nothing can escape from within it

Examples of event horizon in a Sentence

Recent Examples on the Web
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Astronomers believe the flares are coming from the inner edge of the accretion disk just beyond the black hole’s event horizon, or the area around a black hole where the pull of gravity is so strong that not even light can escape, according to NASA. Ashley Strickland, CNN, 19 Feb. 2025 Any matter, light, or radiation crossing the edge of this trap, known as the event horizon, disappears forever. IEEE Spectrum, 30 Jan. 2020 That led physicists to believe that the event horizon was a physical singularity. Steve Nadis, Quanta Magazine, 31 May 2024 To preclude the increase of entropy, this process would have to break the entanglement between the particle pairs across the event horizon. Ahmed Almheiri, Scientific American, 1 Sep. 2022 See All Example Sentences for event horizon

Word History

First Known Use

1956, in the meaning defined above

Time Traveler
The first known use of event horizon was in 1956

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Cite this Entry

“Event horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/event%20horizon. Accessed 10 Mar. 2025.

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