File:Spacetime_lattice_analogy_white.svg · Wikimedia Commons · See Wikimedia Commons

EntityQ181741· pop 68· linked from 465 articles

event horizon

boundary of a region of spacetime from which one cannot escape once entered

AI overview

An event horizon is the boundary around a black hole beyond which nothing—not even light—can escape once it crosses over. It matters because it marks the point of no return in space, helping us understand the extreme physics near black holes and the limits of what we can observe in the universe.

AI-generated from the Wikipedia summary — may contain errors.