Mab-Bu VI moon
Star Trek: The Next Generation
Episode: TNG 215 - Power Play
A moon rated Class M despite intense electromagnetic whirlwinds that mark its charred surface, composed mostly of non-porous rock. Its southern polar area served as a prison for hundreds of disembodied inmates from the Ux-Mal system and, elsewhere, as the final resting place for the 200-year-old USS Essex and her crew.
