🚀 go-pugleaf

>Spin a lump of loose dough in mid-air and see if you can get anything
>other than a naked pizza.


I don't mean to be picky but...

I think these two processes are different enough to warrant mention.  The
pizza dough flattens out because it is all connected together and any
particle that moves pulls all the other particles with it.  In order to
allow the particles to move as far outward as possible, the entire lump
becomes a disk in the plane perpendicular to the axis of rotation.

Galaxies can start with things rotation around every axis about the center.
In this case, the particles are not really bound together, the reason that
the disk flattens out is because any portion of the nebula that is denser
will slow particles down.  Slowly a dense disk will form, and anything that
passes through that disk will lose velocity in that direction.  Eventually,
this completely flattens the nebula.

Sean Christofferson
pauli@u.washington.edu