A gravitational singularity occurs when an astrophysical model, typically based on general relativity, predicts some type of pathological behavior of space-time, such as a point of infinite space-time curvature. In this point, everything will be infinitely deflected by an infinite gravitational well.

The edge of a gravitational singularity is called the event horizon. In a black hole for example, until this point, light (or a theoretical body) can still escape the singularity. Pending that it

• Moves at the speed of light
• Travels in a direction directly perpendicular to the surface of the event horizon.

After this point, nothing can escape.

The term is closely related to the mathematical notion of "singularity": a gravitational singularity occurs when the equations produce a mathematical singularity.