Messier object/Definition

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https://en.citizendium.org/wiki/index.php?title=Messier_object/Definition&printable=yes
A definition or brief description of Messier object.

Systematic list of nebulae, galaxies, and star clusters, first compiled and published in 1771 by Charles Messier, it originally contained 45 objects, later superseded by the New General Catalogue (NGC).

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