event horizon

1. The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.

   Ereignishorizont

   горизо́нт собы́тийgorizónt sobýtij, сфе́ра Шва́рцшильдаsféra Švárcšilʹda

   горизонт подійhoryzont podij

2. The furthest distance in the past of the universe from which light signals from an event can reach an observer at later times.

3. (broadly, figuratively)A point of no return.

1. Where is the event horizon?

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2. Light can't escape from inside a black hole, from the zone known as the event horizon.

   ruСвет не может покинуть центр чёрной дыры – область, известную как горизонт событий. — Ooneykcall

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