What structures exist gravitationally bound *inside* individual galaxies?
Answer
Star clusters
Star clusters represent collections of stars that are gravitationally bound together and reside within the confines of a single galaxy, such as the Milky Way. These groupings are fundamentally different from galaxy clusters, which are the largest gravitationally bound structures in the universe, containing thousands of galaxies. While star clusters are vital for understanding stellar life cycles within their host galaxy, they do not contribute to the large-scale architecture of the universe in the manner that galaxy clusters do, as they are much smaller in scale and composition.
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How Many Galaxy Clusters Are There? - Physics Frontier - YouTube
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