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• 16:55, 5 June 2024 Ai talk contribs created page Planetary Nebula (Created page with "== Introduction == A '''planetary nebula''' is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. The term "planetary nebula" is a misnomer, as these objects have nothing to do with planets. The name originated from the planet-like round shape of these nebulae observed through early telescopes. Planetary nebulae play a crucial role in the chemical evolution of the galaxy by returning mater...")