The Correlation Between Galaxy Collapsing and Solar Systems

In the primordial universe, there's just a whole bunch of stuff going random directions. This comes from the angular momentum they have. So you can imagine a figure skater on ice when they hold their arms out. They'll be spinning slowly, but when they pull them in, conservation of angular momentum means that they have to be spinning much faster for it to work. And within this thing start to break apart and fragment and you get solar systems which because of the overall angular momentum will tend to be correlated strongly with this.