The story
Galactic + center + lobe. From being a lobe of gas overlaying the centre of the (Milky Way) Galaxy.
Etymology from Wiktionary, CC BY-SA 4.0.
Galactic Center Lobe
Today it means: A misidentification of an H-II region 6500 lightyears away as being a structure in the centre of the galaxy 25000 lightywars away, in the constellation Sagittarius. Full definition →