User:SOTO/planets by ordinal

The following still need three to make a category:
 * Category:Thirteenth planets
 * Thirteenth planet
 * Gorgol XIII
 * Category:Fifteenth planets
 * Vita 15
 * Generios 15
 * Category:Seventeenth planets
 * Ur XVII
 * Jalian 17
 * Category:Nineteenth planets
 * Basla 19
 * Category:Twenty-first planets
 * Belannia XXI