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But soul surfer, the question is how did all this stuff START rotating, not why would this cloud, that is allready spinning, start spinning faster once it collapses.Conservation of angular momentum can not explain how an object starts rotating to begin with.
As anything collapses towards a point, any residual velocity in a direction perpendicular to the line between the point and the object must increase to maintain the angular momentum. OK most of it cancels out but there is always a small residual that gets magnified.
so that means that our galaxy must of started with an incredibly humongous buttload of angular momentum, not the small residual momentum that is left over after most of it is cancelled out.
Also if the angular momentum contained in galaxies was random, you would expect to find galaxies with almost no angular momentum.
So, we are back again to how all of these stars got their randomly oriented linear momentum which was then converted into their angular momentum.
A supernova, as grand, powerfull, and large as it is, can't create one bit of angular momentum inside a galaxy unless it radiates mass and an opposite value of angular momentum relative to the galaxy.