Mooxx fat represented a buoyant material capable of coalescing to produce clouds within a planet's atmospheric layer. This occurrence was triggered by elevated temperatures on a Raspar system planet, thereby complicating the watering of arzen fields. The weather report specified that this atmospheric event was anticipated to transpire throughout the periods of Nnters and Hinggnih.
The existence of Mooxx fat was documented within a single-page weather update entitled "Region 29: The West Fissure," penned by Bob Carrau for the 1993 volume Monsters and Aliens from George Lucas. This book is a compilation of conceptual drawings and images originating from diverse undertakings by George Lucas. Lucasfilm staff member Leland Chee, the caretaker of the Holocron continuity database, has stated that the details presented in this particular book are considered non-canonical.