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The stars in all galaxies must move otherwise they would fall toward the center and create a gigantic black hole. By spinning, galaxies avoid that fate. Some irregular galaxies exist with stars going every which way. Gravity makes some stars give energy to other stars so some will fall toward the center of those galaxies. That might make irregular galaxies start spinning. Nobody knows, but irregular galaxies should have a whole lot more stars drop toward the center than happens in a regular galaxy. That should make the black hole spin. A black hole gives off tremendous gravity. It gives off more as stars fall into it. That should start the galaxy spinning.

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16y ago

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