StructuredPair ,

The fact they spin and the bits interact gravitationally makes them symmetric. There are almost certainly some asymmetric galaxies as we know galaxies collide and they will be asymmetric for a bit afterwards, but the spinning and fiction of gravity will make them symmetric again fairly quickly on galactic time scales.

WintLizard ,
@WintLizard@sopuli.xyz avatar

Your question made me realize I had never thought about this at all so I spent some time searching. If I am understanding this article correctly it essentially boils down to the factors that would cause rotational symmetry at a smaller scale ie spinning sand on a plate apply at the galaxy scale as well.

Demuniac ,

Id guess if the arm gets too long, gravity won’t be strong enough anymore so the stars there will sort of just drift off

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