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A comment on What if Planet 9 is a Primordial Black Hole? (2019). Parent comment

Re:What if Planet 9 is a Primordial Black Hole? (2019) by heavenlyblue on Friday August 13, 2021 @01:24PM (#28171808)
What does it mean “to spin” in this case?
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Re:What if Planet 9 is a Primordial Black Hole? (2019) by renewiltord on Friday August 13, 2021 @01:51PM (#28172113)
It means the black hole has angular momentum, which is detectable due to the resultant frame dragging (effect of the spinning on the spacetime around it) and presumably also due to the flattening of the sphere of the event horizon.
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