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The nature of the matter at the center (singularity) of a black hole is not fully described by our current physical theory and remains somewhat of a mystery; since it is not directly observable it remains subject to speculation; however it is fairly universally recognized it occupies zero volume and has infinite density. Sometimes it is referred to as exotic matter. There are other notional and real structures around the singularity, such as the event horizon, the ergosphere, and the photon sphere, but these are more notional constructs that describe the space and physical properties around them as opposed to being made of matter. Ordinary matter and energy is also believed to be usually present - infalling matter present in an extremely energetic ring around the outside of the black hole (the accretion disk aligned at the 'equator') and possibly relativistic jets of matter and electromagnetic energy at the poles.

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