How can a galaxy have spiral arms and circular orbits?
The stars are not in circular orbits; they are in spiral orbits.
What causes the spiral? The orbital decay is due to friction.
Friction with what? Something. Something tiny I think.
---2008/07/28 different idea
These may be new, temporary, structures recently formed by the collision of two galaxies, and soon to be blended away, after a revolution or two.
Antennae Galaxies
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