Read Siege of Titan (Star Crusades Uprising, Book 1) Page 30
CHAPTER NINE
Since the founding of the new colonies the status of Old Earth and its solar system became less important. The colonies at Alpha Centauri quickly matched and then surpassed the old world. As further colonies spread through the Centauri Constellation the balance of power shifted leaving Earth as a distant backwater. Though it was still the centre of old culture and knowledge it transformed over generations into just one of many backwater systems inhabited by those unable or unwilling to leave. Following the Great War, the Centauri Confederation was founded with each colony world being made an equal of the next. In one swift move, Old Earth became just another colony in an alliance that no longer even shared its name.