Event __, Theoretical Boundary Around a Black Hole

This page is the CodyCross answer for the clue below from Medieval Times, Group 234, Puzzle 5 (Satirical Poetry).

Question is: Event __, Theoretical Boundary Around a Black Hole

and the answer is: HORIZON

Word Meaning:

HORIZON — The visible horizontal line (in all directions) where the sky appears to meet the earth in the distance.

Definitions from Wiktionary.

Event __, theoretical boundary around a black hole — CodyCross Answer | CodyCross Solutions