Rotating black hole

A rotating black hole is a black hole that possesses angular momentum. All currently known celestial objects, including planets, stars (Sun), galaxies, and black holes, spin about one of their axes.

The boundaries of a Kerr black hole relevant to astrophysics. Note that there are no physical "surfaces" as such. The boundaries are mathematical surfaces, or sets of points in spacetime, relevant to analysis of the black hole's properties and interactions.
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