Addressing a current controversy in physics about information in black holes, “I propose that the information is stored not in the interior of the black hole as one might expect, but on its boundary, the event horizon.”
The event horizon is a boundary around a black hole beyond which events cannot affect an outside observer, also known as “the point of no return” — where gravitational pull becomes so great as to make escape impossible.
Hawking is now suggesting that the information about any incoming particles passing through this event horizon is translated into a 2D hologram. “The idea is the super-translations are a hologram of the ingoing particles,” he said. “Thus they contain all the information that would otherwise be lost.”