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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The North America Nebula (NGC 7000) was discovered by William Herschel in October 1786. It was first photographed by Max Wolf in December 1890. It is a large emission nebula located in...