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Centroids are often used to talk about systems of bodies, rather than just one. For example, in astronomy, you have twin planets that orbit their centroid. It's an important concept when discussing axis of rotation or angular momentum, etc. The second point is that symmetric objects that aren't of uniform density can still have their center of mass coincide with their centroid: think of a sphere with a very dense center that gets less dense as you near the crust. -Foxtrot 20:09, 15 January 2009 (EST)