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A rotating black hole is a black hole that possesses angular momentum. In particular, it rotates about one of its axes of symmetry. ==Types of black holes== There are four known, exact, black hole solutions to Einstein's equations, which describe gravity in General Relativity. Two of these (the Kerr and Kerr–Newman black holes) rotate. It is generally believed that every black hole decays rapidly to a stable black hole; and, by the no-hair theorem, that (except for quantum fluctuations) stable black holes can be completely described at any moment in time by these eleven numbers: * mass-energy ''M'', * linear momentum ''P'' (three components), * angular momentum ''J'' (three components), * position ''X'' (three components), * electric charge ''Q''. These numbers represent the conserved attributes of an object which can be determined from a distance by examining its electromagnetic and gravitational fields. All other variations in the black hole will either escape to infinity or be swallowed up by the black hole. This is because anything happening inside the black hole horizon cannot affect events outside of it. In terms of these properties, the four types of black holes can be defined as follows: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rotating black hole」の詳細全文を読む スポンサード リンク
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