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  • I wonder if white holes have antigravity.

  • I think the bars are formed early-on by a mechanism related to the one that creates the circular region of emptiness between the core and the ring of a ring galaxy. Suppose once a bit of core ejecta reaches out to this region it's no longer attracted to the core but repelled by core gravity, and at the same time it stops being repelled by ring gravity and becomes attracted to the ring. Seems like a quantum gravity effect with a quantum wavelength close to the diameter of the galaxy.

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