noun
Local Group
Astronomy term referring to the galaxy group that includes the Milky Way. Often used with の to modify another noun, e.g., 局部銀河群の銀河.
局部銀河群には、アンドロメダ銀河や天の川銀河が含まれている。
The Local Group includes the Andromeda Galaxy and the Milky Way Galaxy.
銀河群 is a general term for a galaxy group, while 局部銀河群 specifically refers to the Local Group that contains our Milky Way.
Compound of 局部 (local, part) and 銀河群 (galaxy group). The term is a direct translation of the English 'Local Group'.