As of 827 G.E. (Galactic Era, the number of years after its founding), the Galactic Empire comprises millions of inhabited worlds with 500 quadrillion residents. According to the "Foundation" series chronology established in the late 1990s, it comes into existence approximately 10,000 CE, year one of the Galactic Era. (The establishment of the Empire was originally 34,500 CE, according to Asimov's unofficial unpublished early 1950s chronology.) The Galactic Empire was made possible by the ability of humans to travel through hyperspace. The space navy of the Galactic Empire is called the "Imperial Navy". The empire's capital, named Trantor, is the closest habitable planet to the center of the galaxy, and the novels in the "Foundation" trilogy describe its fall, over a period of centuries, and a period of anarchy and decay, a parallel to the fall of the Western Roman Empire and the Dark Ages.