🚀 go-pugleaf

november@agate.net wrote:
> 
> Why do the planets, and other bodies, revolve around our star in a
> relatively two-dimensional plane?  By this, I mean the orbits of the
> planets (as well as astroids, etc.) seem to form a collective flat
> disc when modeled (I know Pluto's orbit is a little bit askew).  Why
> not orbit three-dimensionally?  A lot of galaxies and everything else
> related also seem to be rather two-dimensional in shape.  Is this just
> a property of gravity that really has no explaination?
> 
> I'm asking this just out of curiosity.  I'm not yet very knowledgable
> in this subject.

The condensation of a nebula (or general mess of dilute star stuff)
conserves angular momentum.  As the average radius shrinks the stuff
spins faster and faster into a disk.  When it gets lumpy due to
turbulence, collision, and gravitationally-driven accretive
inhomogeneity, the lumps orbit in that plane.

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

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