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Cesium fuel leaks from a Peacekeeper Marauder as it approaches Moya.
Cesium fuel was a phosphorescent fuel that powered many of the Peacekeeper crafts, including Marauders. Apparently made of cesium, an alkali metal, it was also seen powering Leviathans (albeit Talyn was a Peacekeeper/Leviathan hybrid). Damaged vessels were usually seen leaking cesium fuel, and could also vent it if the need arose.