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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M31 is one of my favourites. The processing was tricky, because Siril didn't be able to execute the LRGB script. When it was working on the L channel, I got an error message about there...