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Universe Nebula Protoplanetary nebula Yellow hypergiant Hypergiant Wolf–Rayet star Interstellar medium IRAS 17163-3907 Astronomy Star types Space | Astronomy & Astrophysics A&A 552, L6DOI:Add to Reading ListSource URL: www.aanda.orgDownload Document from Source WebsiteFile Size: 345,86 KBShare Document on Facebook |