By0Meeri7
I mean the abbreviations M (eg M31, the Andromeda Galaxy) and NGC.
(1 votes)
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M = brass
NGC = New General Catalogue
The difference is old. Some objects are available in both catalogues, e.g. M31 = NGC224
Thank you. At the age of objects or catalogues?
https://de.wikipedia.org/wiki/New_General_Catalogue
https://de.wikipedia.org/wiki/Messier-Katalog