event horizon

noun

Astronomy.

1. the boundary around a black hole on and within which no matter or radiation can escape.

event horizon

noun

1. astronomy the surface around a black hole enclosing the space from which electromagnetic radiation cannot escape due to gravitational attraction. For a non-rotating black hole, the radius is proportional to the mass of the black hole

event horizon

1. A spatial boundary around a black hole inside which gravity is strong enough to prevent all matter and radiation from escaping. The inability of even light to escape this region is what gives black holes their name.

Word History and Origins

Origin of event horizon¹

First recorded in 1970–75

Example Sentences

It predicts the existence of black holes and the event horizon, a boundary beyond which nothing -- not even light -- can escape.

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"As long as the matter is still rotating outside the event horizon -- before being inevitably pulled in -- it can emit final signals of light that we can, in principle, detect."

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“No matter how much compliments, no matter how much adoration — whatever people were throwing my way — as soon as it went past the event horizon and into me, it was a black hole where it just disappeared. Nothing stuck and I didn’t feel good about myself,” Hammer said on the podcast.

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With these considerations in place, the new version of NeRF was able to recover the structure of orbiting bright features around the event horizon of a black hole.

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That distance defines the black hole’s spherical event horizon.

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