The Third Great Expansion was a period of time that occurred during the reign of the Galactic Republic. During the era, settlers from the Core Worlds and the Inner Rim colonized outlying worlds that had been surveyed and made available for settlement by laws such as the Colonization Act and the Planet Grant Amendment. One such world was the planet Mygeeto in the Albarrio sector, which was colonized by the Muuns, a sentient species from the world Muunilinst.