what does its structure consist of?
The no-hair conjecture postulates that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, charge, and angular momentum; the black hole is otherwise featureless. Research on this is still going on.
Black hole
The no-hair conjecture postulates that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, charge, and angular momentum; the black hole is otherwise featureless. If the conjecture is true, any two black holes that share the same values for these properties, or parameters, are indistinguishable from one another. The degree to which the conjecture is true for real black holes under the laws of modern physics, is currently an unsolved problem.
who predicated that black holes emit radiation and what it is called Stephen Hawking what is this black hole all about? It  is a region of spacetime where gravity is so strong that nothing, no particles or even electromagnetic radiation such as light can escape from it. can you give me an example of this region found outer space? A massive one has been found in the center of galaxy Messier 87 to name one. what are some of the physical properties of this hole region? The simplest static black holes have mass but neither electric charge nor angular momentum. The Kerr–Newman metric describes a black hole with both charge and angular momentum. While the mass of a black hole can take any positive value, the charge and angular momentum are constrained by the mass.
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Black hole [SEP] Properties and structure
The no-hair conjecture postulates that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, charge, and angular momentum; the black hole is otherwise featureless. If the conjecture is true, any two black holes that share the same values for these properties, or parameters, are indistinguishable from one another. The degree to which the conjecture is true for real black holes under the laws of modern physics, is currently an unsolved problem. These properties are special because they are visible from outside a black hole. For example, a charged black hole repels other like charges just like any other charged object.