Two equal sized HH Black Holes can approach each other differently, with- or without a central bar. Spiral Galaxies or Hoags objects without spirals, with two main GABHs .
see also: New Black Hole Physics, by Fermion String Repelling Black Holes. the Origin of Quick Star/Galaxy Formation.
and: Higgs field-Electric Dark Matter Black Hole Evolution according to Quantum FFF Theory.
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Galaxy Rotation Curves explained.
