Why do galaxies look like they spread out in a single plane (ie, why do they look more like frisbees than spheres)?
In: Physics
Something I haven’t seen explained yet which is crucial to understanding this: Nothing can spin on more than one axis at a time.
Say you have a ball floating in the air before you. You spin the side facing you downward, now the axis of rotation is a horizontal line in front of you. Try to add a spin to the right at the same speed, and you don’t have two different spins; you have one spin diagonally downward and to the right.
Thus, spin forces *cannot* create a sphere, they can only create a disc shape.
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