Omega Centauri | Article about Omega Centauri by The Free Dictionary
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Omega Centauri (sen-tor -ÿ, -ee) (ω Cen; NGC 5139) A huge impressive globular cluster, magnitude 3.7, diameter 0°.6, in the constellation Centaurus. At about 5212 parsecs distant, it is one of the closest globulars to the Solar System. The million or so stars of which it is composed show a surprising range of metal content and possibly age. It is an X-ray source.