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Loading contentThe specialist catalogues of interstellar clouds — Sharpless's HII regions glowing around young stars, Barnard's dark dust clouds silhouetted against the Milky Way, and Abell's large, faint planetary nebulae. Together they map the gas and dust between the stars.
Facts on this topic will be cited from these primary and reference sources.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.