event horizon
/əˈvɛnt həˈraɪ.zən/
释义
名词noun
- 1(astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.
- 2(astrophysics) The furthest distance in the past of the universe from which light signals from an event can reach an observer at later times.
- 3figuratively, by extensionA point of no return.