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

Announcing one competitor, he says, “Her mouth is an event horizon.”

From The Daily Beast