Earth was the third planet of the Sol system and the homeworld of humanity.

During the Population Wars, redirected asteroids wreaked cataclysmic destruction on much of the planet's surface, killing the majority of its population and distorting its crust so much that the surface was unrecognizable. (RCN2, RCN3)

In 5151 CE, Earth was apparently livable, but its conditions were either pastoral or barbaric depending on your viewpoint.8:8