stellar orbits in galaxies

When the Sun moves in its orbit in the Milky Way, what exactly is it
orbiting around and why? What kinds of general statements can be made
about the orbits of the other stars in the Milky Way? For example, are
there some basic classifications of orbit types? If so, how typical is
the Sun's orbit?

The same questions apply as well to other galaxies.

What would be a good book or article to read on stellar orbits in galaxies?

When the Sun moves in its orbit, it bobs up and down in the equatorial plane
of the Milky Way. Why does it do that? If, for comparison, we look at the
orbit of the Earth in the solar system, is there any comparable bobbing
motion?
--
Ignorantly,
Allan Adler <ara@xxxxxxxxxxxxxxxxxxxx>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.
.

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