The Earth Sphere Wars were a period of planet wide warfare from 2515 following a series of disasters on Earth that led to the collapse of society as it was known until 2709 with the establishment of the Earth Union, the predeccesor of the Earth Federation. Little records exist from this time on Earth. Contact between it and all of the colonies in other stars systems such as Eden and Song-Tseng was severed at this time and to this day several lost worlds of humanity are thought to be still out in the galaxy since the records of their existence might very well have been destroyed.