= No-hair theorem
{wiki=No-hair_theorem}
The No-Hair Theorem is a concept in general relativity and black hole physics that suggests that black holes can be completely characterized by only a few observable properties: mass, electric charge, and angular momentum (or spin). This means that, regardless of the material that formed a black hole or any information about the matter that collapsed to create the black hole, all external, observable features of the black hole can be reduced to these three properties.
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