What is the event horizon of a black hole?
A) "surface" at which any object passing through it will leave with greater energy than when it entered
B) "surface" at which all events happen
C) infinitesimally small volume at the center of the black hole that contains all of the black hole's mass
D) "surface" from inside of which nothing can escape

Question

Quizplus · Accepted Answer

The event horizon of a black hole is the boundary beyond which nothing, not even light, can escape its gravitational pull.

What Is the Event Horizon of a Black Hole