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Messier objects are a set of astronomical objects catalogued by Charles Messier in the 18th century. Messier objects include nebulae, star clusters, and galaxies. While most Messier objects are located in the Milky Way galaxy, there are also some that are located outside the Milky Way. For example, the Andromeda Galaxy, which is the closest major galaxy to the Milky Way, is a Messier object.