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Hoag's Object, which is actually a galaxy, is the strange circular object at the upper right. It was discovered by Arthur Hoag in 1950 and is the prototype of a classic "ring galaxy". Hoag's Object lies at a distance of about 600 million light years. Other distance galaxies are scattered around the image; the most prominent is PGC 54643 at the lower left of the image, 500 MLy away. This is a 5-hour image with 2:1:1:1 hours of L:R:G:B.