Terra is the third planet from the sun of the Terra system. Naturally habitable, it was colonized shortly after its discovery in SEY 2516 and has since become the most populous planet in the United Empire of Earth (UEE), as well as a center of culture and commerce. Terra's political leaders played key roles in the movement that ended the despotic rule of the Messer Era. Today, Terra remains a center of progressive politics, and is home to the Transitionalist political party.