No one knows whether Mnggal-Mnggal can be killed, but a strike on
the planet Mugg Fallow would be a logical move. The ships in orbit above
the site include a few that are bursting with volatile arsenals stored next
to leaking antimatter engines. Such a vessel, if nudged out of orbit into a
collision with the planet beneath, could trigger a chain reaction that might
destroy Mugg Fallow.
-Star Wars RPG: The Unknown Regions, Chapter IV: Hazards