A Black Hole Singularity May Be a 3D Surface Where General Relativity Goes to Die

A new study by Andrew J. S. Hamilton and Tyler McMaken argues that the singularity inside a Schwarzschild black hole is a flat three-dimensional spacelike boundary, not a point.

Their general-relativistic analysis suggests two infalling observers from opposite sides cannot stay causally connected or reach the same final event.

The result challenges the standard textbook picture of black hole singularities and may affect future thinking on spacetime breakdown and quantum gravity.