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nebula catalog comparison table

Subject	has acronym	has definition	has object type
gaseous nebula catalog			gaseous nebula
Messier catalog		One of the earliest catalogues of nebulous-appearing astronomical objects, compiled in 1781 by the French astronomer Charles Messier. Messier's catalogue included many objects that were later realized to be galaxies.	nebula
New General Catalogue	NGC	A catalogue of 7840 nebulae, star clusters, and galaxies that was published in 1888 by John Dreyer.	nebula
planetary nebula catalog			planetary nebula

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