NGC 5139 (Omega Centauri), a 4th-magnitude globular cluster in Centaurus.

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https://ocastronomers.org/wp-content/uploads/2019/01/ngc5139.jpg

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Additional Information Originally mistaken for a star (hence the name Omega Centauri), this is the brightest and biggest globular cluster in the heavens (from our perspective here on Earth). In angular width it is nearly the size of the full moon. However, it is too far south (decl. 47 deg S) to be observed by most of the world's population.