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An expanded star refers to a star that has undergone significant changes in its structure, typically during the later stages of its life cycle. As a star exhausts its nuclear fuel, it can expand into a red giant or supergiant phase, where its outer layers swell significantly. This expansion occurs as the star's core contracts while the outer layers are pushed outward due to increased pressure from nuclear fusion in the shell surrounding the core. Eventually, these expanded stars may shed their outer layers, leading to the formation of planetary nebulae or supernovae, depending on the star's mass.

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