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Wikipedia definition
1. Omega CentauriOmega Centauri (ω Cen) or NGC 5139 is a globular cluster in the constellation of Centaurus, discovered by Edmond Halley in 1677 who listed it as a nebula. Omega Centauri had been listed in Ptolemy's catalog 2000 years ago as a star. Lacaille included it in his catalog as number I.5. It was first recognized as a globular cluster by the English astronomer John William Herschel in the 1830s. ("Omega Centauri" is a Bayer designation, even though the object is a cluster.
Read “Omega Centauri” on English Wikipedia
Read “Ω星団” on Japanese Wikipedia
Read “Omega Centauri” on DBpedia

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