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Loading contentA catalogue of HII regions — clouds of ionised hydrogen glowing around hot young stars — compiled by Stewart Sharpless. Its second edition (Sh2, 1959) lists 313 emission nebulae across the northern Milky Way, including many of the sky's great star-forming complexes. Objects carry an 'Sh2' number.
Facts on this topic will be cited from these primary and reference sources.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.