I think people might be missing the point of your question. I am assuming you are curious why they are all going in the same direction rather than caring if it is clockwise or counterclockwise. This is because there would have been stuff going all different directions early on but slow things crash into each other and are destroyed/broken up or pushed in a new direction until eventually you are left with only the items going in the dominant direction (and which way the dominant direction was, was just chance).
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