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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
Trippe says the system would open a completely new window into the processes taking place in the vicinity of the black holes' event horizons, the boundaries from beyond which nothing escapes.
—Tereza Pultarova, Space.com, 4 Jan. 2025
That is because, like all black holes, they are bounded by a one-way light-trapping surface called an event horizon.
—Robert Lea, Space.com, 19 Dec. 2024
To support their claim, the trio argued that any process that would allow a black hole’s charge or spin to reach the extremal limit could also potentially result in its event horizon disappearing altogether.
—Steve Nadis, WIRED, 15 Sep. 2024
It is widely believed that black holes without an event horizon, called naked singularities, cannot exist.
—Steve Nadis, WIRED, 15 Sep. 2024
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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 20 Jan. 2025.
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