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From Wikipedia: "An astronomical body's Hill sphere is the region in which it dominates the attraction of satellites." In other words, any object (such as a star, or a small galaxy) within a galaxy's Hill sphere can have a stable orbit; the orbit of anything outside of such a Hill sphere will eventually decay; in other words, it might escape, or fall towards the galaxy.

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10y ago
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9y ago

Norte XIV TVR :: X4

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Q: What occurs in HII regions of the galaxy?
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