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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Ou4 is the most extensive planetary nebula to date. Known as the Giant Squid Nebula, it is a bipolar nebula that stretches a dizzying length of 50 light years. This is more than an appa...