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It all comes down to the conservation of angular momentum. Everything in the universe has some form of momentum, a direction of movement. When a stellar cloud begins to collapse, although everything has a different direction of movement there is going to be more momentum in one direction than another. Anything that deviates from the “preferred” direction looses energy as it is forced to conform with that direction of movement. It is this preferred direction - momentum - that causes a flat disk.
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