But the secret has leaked to the other civilizations starting a race for all the inhabitable worlds in the galaxy! chevron_right. Galactic Civilizations IV utilizes new features like AI characters, star sectors, ministers, central control, a much bigger technology tree, and more. (shelved 1 time as galactic-civilizations) avg rating 4.41 - 305,153 ratings - published 2014 Huge scope can be overwhelming. There are currently two mining planets in Galactic Civilizations III, Promethion, and Thulium.