On Tuesday, he explained his new theory: "I propose that the information is stored not in the interior of the black hole as one might expect, but in its boundary, the event horizon," Hawking said. The event horizon is the sort of shell around a black hole, past which all matter will be drawn into the dense object's powerful embrace.
According to Hawking's idea, the particles that enter a black hole leave traces of their information on the event horizon. When particles come back out — in a phenomenon called Hawking Radiation — they carry some of that information back out, preserving it. Technically, anyway.
The translations that occur form a sort of hologram of the original particles, Hawking said — a hologram in the sense that 3-D information is recorded on a 2-D surface. When radiation leaves the black hole, it carries some of that information preserved on the event horizon with it.
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