Hickson 40 is a well-known galaxy group in the constellation Hydra. It consists of 5 separate members (three spiral galaxies, an elliptical galaxy, and a lenticular galaxy) and is in the stage of merging. Member galaxies of Hickson 40 interacted in the early stages of their formation to create a crowded galaxy sampler. Hickson 40 resides at a distance of 300 million light years and is so dense that it could even exist within a region close to the diameter of the Milky Way's galactic disk.
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This article is an automated import of the Wikipedia article "Hickson 40", available at https://en.wikipedia.org/wiki/Hickson_40 . Text is licensed under CC BY-SA 4.0.