The Omega Centauri globular cluster in the constellation of Centaurus. At a distance of 17090 light-years, this is the largest and most massive known globular cluster in the Milky Way.
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NGC 6559 is an emission nebula, a star forming region that lies about 5000 light-years away from Earth, just east-northeast of its much more famous neighbor, the Lagoon Nebula (Messier ...