English

Noun

event horizon ‎(plural event horizons)

1. (astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.
2. (by extension) A point of no return.

Related terms

• absolute horizon
• apparent horizon
• Cauchy horizon
• dynamical horizon
• isolated horizon
• Killing horizon
• particle horizon

Coordinate terms

• (astrophysics):
• singularity
• ergosphere
• photon sphere
• Schwarzschild radius
• frame dragging

Translations

See also

• general relativity
• special relativity