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What I think is the most interesting part:

> “When gas spirals into a black hole from afar, it can either flow in the same direction the black hole is rotating, or in the opposite direction. We found that the latter case is more likely to match the multi-year observations thanks to their relatively higher turbulent variability”

The direction the black hole is rotating makes a difference due to frame dragging.

https://en.wikipedia.org/wiki/Frame-dragging

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Yup!, that is interesting, makes you think! So why does the acretion disk form at all? as a singularity should have be perfectly uniform gravitationaly. So the laws change @ the boundry and what we percieve as spin in a black hole, may be an effect caused by the integration of a singularitys gravity with 3 dimensional space. Under the event horison is the naked singularity, where something else, entirely, is happening. But yes, the lack of handedness to the disk points to something not quite playing by the rules. And that there is evidence of some turbulence, shear?, at the event horison, speaks to some possible "leakage" from the black hole, or it could just be a natural phenominon of a singularity and 3D space existing at the same time and place. And the link to frame dragging, desribes, what is called shear in fluids, which takes us all the way back to is light a fluid, particle,wave,field, or what arguments, good fun.

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