Do black holes rotate, and if yes, how fast? This question is fundamental and has broad implications, but still remains open. There are significant observational challenges in current spin determinations, but future facilities offer prospects for precision measurements.
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Laor, A. Another look at black hole spins. Nat Astron 3, 374–376 (2019). https://doi.org/10.1038/s41550-019-0755-6
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DOI: https://doi.org/10.1038/s41550-019-0755-6
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