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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
That led physicists to believe that the event horizon was a physical singularity.
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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.
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Ahmed Almheiri, Scientific American, 1 Sep. 2022
Now, the white dwarf might be orbiting within millions of miles of the black hole’s event horizon—the point beyond which no matter or light can escape.
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Sara Hashemi, Smithsonian Magazine, 14 Jan. 2025
The event horizon is the point around every black hole at which gravity becomes so strong not even light is fast enough to escape.
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Robert Lea, Space.com, 13 Jan. 2025
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Word History
First Known Use
1956, in the meaning defined above
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Cite this Entry
“Event horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/event%20horizon. Accessed 11 Feb. 2025.
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