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Loading contentA chart of the Messier objects — the nebulae, clusters, and galaxies of Charles Messier's eighteenth-century catalogue — each placed at its real celestial coordinates and sized by its apparent extent. The classic target list for a first tour of the deep sky.
Facts on this topic will be cited from these primary and reference sources.
Openly-licensed deep-sky catalogue: object types, positions, magnitudes, sizes, morphology, and cross-identifiers.