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The Necklace Nebula (PN G054.2-03.4) is a 19-trillion-kilometre-wide (2.0 light-year-wide) [1] planetary nebula located about 15,000 light-years away in the northern constellation Sagitta. It was discovered in 2005 from the Isaac Newton Telescope Photometric H-alpha Survey (IPHAS), a ground-based H-alpha planetary nebula study of the North ...