Time, at least defined thermodynamically, might not always run forward, at least not inside black holes.

Recent research published in Physical Review Letters may have discovered a new area law in general relativity that describes the geometry of black holes as curved "holographic screens."

In their study, Raphael Bousso, a professor at the University of California, Berkeley and Lawrence Berkeley National Laboratory, and Netta Engelhardt, a graduate student at the University of California, Santa Barbara, developed an alternative explanation of a black hole's event horizon, the point-of-no-return that separates a black hole from its observers.

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