Scientists have just discovered the Milky Way’s equivalent of a giant fake mustache.

For four decades, astronomers have puzzled over a giant loop apparently ballooning out of the center of the Milky Way.

Known as the Galactic center lobe (GCL), the structure has been blamed on everything from the aftermath of a supernova to an ancient eruption from the Milky Way’s core – so many competing explanations that one team described it as “a Rorschach test for Galactic astrophysics.”