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Re:In a photo of a black hole, a possible key to mysteries by pdonis on Thursday June 04, 2020 @08:13PM (#23423591)
> the geometry of the space (size/mass of the black hole), its angular velocity (angular momentum) and the charge which are the only measurable information about the black hole.

This is true for a stationary black hole, i.e., one that never changes with time, but no real black hole is exactly stationary; every real black hole has matter and radiation falling into it. Non-stationary black holes can have more measurable information than just mass, spin, and charge.

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