Black hole - Black hole - Artwork: The event horizon represents the limit of the...

Black hole - Black hole - Artwork: The event horizon represents the limit of the spatial extension of the black hole, defining what can be considered as its size. The region delimited by the horizon of events thus differs from the central gravitational singularite, which would be of an infinite density - Event horizon is a boundary in spacetime beyond which events cannot affect an outside observer. It is defined as “” the point of no return”””, the point at which the gravitational pull becomes so great as to make escape impossible, even for light. Light emitted from inside the event horizon can never reach the outside observer