Black Holes
Black Holes are such extraordinarily large and massive objects that an explanation requires a theory that involves general relativity (the theory of gravitation) and quantum mechanics (the theory of microscopic particles), in short a theory of
quantum gravity.
Jacob Bekenstein showed that adding a low-energy photon with a wavelength the size of a black hole would add an area one Planck-length squared to its event horizon.
Leonard Susskind argued that the photon added one bit of information to the internal entropy of the black hole (in the singularity at it's center) and one bit of information at the event horizon. Susskind's "holographic universe" interprets the event horizon as a hologram of the internal lost (or hidden) information in a black hole
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