The area of space around a black hole that separates the inside and outside of the black hole, from which even light cannot escape, is called a(n)

event horizon

Explanation:

In the event horizon of the black hole, the force of gravity is so intense that nothing, not even light, can escape. Through an experiment conducted by Harvard, the existence of that "no return" zone around the black hole was verified. The event horizon delimits the boundary between the objects that will be saved from entering and the objects that will end up inside the black hole product of gravitational forces.

answer; longitudinal;