Similarly, to observers outside a black hole, objects don’t appear to fall into it. Rather, they are smeared in a thin layer onto the event horizon. This has led physicists to compare the event horizon of a black hole to a hologram. These are two-dimensional surfaces that contain all the information needed to generate a complete three-dimensional image. These aren’t like the 3D images one sees in the cinema, which create an illusion of three dimensions. One can walk in a circle around a hologram of an object and it will appear as if one is walking in a circle around the actual
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