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
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And just like the existence of a black hole’s event horizon results in the creation of Hawking radiation, the existence of a cosmological horizon must also — if the same laws of physics are to be obeyed — create radiation.
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Ethan Siegel, Big Think, 25 Sep. 2025
As gravity is related to mass, the size of an event horizon, also known as the Schwarzschild radius — after Karl Schwarzschild, the first physicist to solve the equations of general relativity and inadvertently predict the existence of black holes — also depends on the mass of a black hole.
—Robert Lea, Space.com, 10 Sep. 2025
These measurements confirm a prediction Hawking made in 1971 about black hole event horizons—the boundaries beyond which nothing, not even light, can escape from their gravitational grasp.
—Clara Moskowitz, Scientific American, 10 Sep. 2025
In 2012, physicists showed that this paradox is tightly linked to the nature of the event horizon.
—Matt Von Hippel, Quanta Magazine, 27 Aug. 2025
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Ethan Siegel, Big Think, 25 Sep. 2025
As gravity is related to mass, the size of an event horizon, also known as the Schwarzschild radius — after Karl Schwarzschild, the first physicist to solve the equations of general relativity and inadvertently predict the existence of black holes — also depends on the mass of a black hole.
—Robert Lea, Space.com, 10 Sep. 2025
These measurements confirm a prediction Hawking made in 1971 about black hole event horizons—the boundaries beyond which nothing, not even light, can escape from their gravitational grasp.
—Clara Moskowitz, Scientific American, 10 Sep. 2025
In 2012, physicists showed that this paradox is tightly linked to the nature of the event horizon.
—Matt Von Hippel, Quanta Magazine, 27 Aug. 2025
See All Example Sentences for event horizon
Cite this Entry
“Event horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/event%20horizon. Accessed 2 Oct. 2025.
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