As I know, most galaxies are spiral, some elliptical, and a rare type is ring-shaped.

What causes a galaxy to become a specific shape (i.e. ring vs spiral)?

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    $\begingroup$ This is a good, but not easily answerable question. But did you read the Wikipedia article on galaxy types and morphology, as well as links therein? It covers the question fairly well. $\endgroup$ – pela Aug 7 at 6:23
  • $\begingroup$ Interesting article here about new research into the shape of the Milky Way. It seems it may not be flat after all. $\endgroup$ – BillDOe Aug 7 at 20:58

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