▸ noun:
(astronomy) A catalogue number used to identify any one of more than one hundred galaxies, nebulae, and other deep-sky objects visible in the night sky; the designation formed by the surname Messier or letter M being prepended to the number, as in Messier 31 or M31 (the Andromeda Galaxy).
▸ Words similar to Messier number
▸ Usage examples for Messier number
▸ Idioms related to Messier number
▸ Civic discussion about Messier number (New!)
▸ Words that often appear near Messier number
