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Black holes that aren't spinning (Schwarzchild) are all remarkably similar in structure (some texts will tell you that by their nature and definition they are almost identical, see the "no-hair theorem"). To the best of our scientific understanding, they are spherical with the boundary of the black hole being defined by the event horizon whose diamater is proportional to the black hole's mass - the event horizon being a boundary at which escape velocity is the speed of light. Hence, inside the black hole, within this sphere, no light nor matter can escape. At the center of the black hole is a singularity, a point where matter is crushed by gravitational force to infinite density or infinite space-time curvature, where laws of physics would seem to break down and notions of time and space may no longer apply. Because of their mass you would likely observe other structures outside the black hole such as an accretion disk of accumulated matter in orbit, or jets of particles or radiation cause by infalling matter and electromagnetic effects, and perhaps other effects but strictly speaking these would not be part of the black hole itself. For a spinning black hole, there are some other considerations; a notional oblate spheroid (the ergosphere) would surround the spherical horizon and touch at the poles on the axis of spin; it would also possess a ring-shaped singularity (see Kerr black holes).

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