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Older galaxies mostly tend the revolve forming a disk. Why are the stars not revolving around the center of the galaxy like a sphere instead similar to electron in an atom?

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marked as duplicate by CuriousOne, John Rennie, user36790, anna v, user10851 Jun 23 '16 at 5:17

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There are other shapes of galaxies. In particular, look at ellipticals.

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