“Exhaustively,” he said. “The important thing to know about Starswirl's spells is how flexible they are. The spell in question was developed in response to urging from his friend, Clopurnicus, who wished for a spell to study heavenly bodies, beginning with the moon.” An eager expression came over his face. “You see, teleportation spells at the time were generally limited in range, and often unpredictable, which was why most unicorns would not attempt to cast them.”