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

/ ĭ-vĕnt′ /

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

“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.

From Los Angeles Times

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.

From Science Daily

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

From Science Magazine

In the mid-1970s, Hawking and theorist Jacob Bekenstein independently argued that a black hole should possess an entropy proportional to the area of its event horizon.

From Science Magazine

They imagine a spherical shell of dust of a given radius and mass lurking behind the event horizon and distorting spacetime there.

From Science Magazine