For twelve thousand years, Trantor was more than just a planet; it was the administrative pulse of a galaxy-spanning civilization. As the capital of the Galactic Empire, it represented the pinnacle of human achievement and, ultimately, the hubris that would lead to the long night.
Encyclopedia Galactica
TRANTOR... The capital of the First Galactic Empire. At the height of its power, it was an ecumenopolis, a city-planet, with a population of 40 billion, devoted almost entirely to the administration of the Empire.
The Ecumenopolis
Imagine a world where nature has been entirely subsumed by steel, glass, and humanity. Trantor was an ecumenopolis—a planet-wide city. Its entire surface of 194 million square kilometers was enclosed under immense metal domes, shielding its inhabitants from the weather and creating a perfectly controlled environment.

The population of Trantor stood at a staggering 40 billion. These billions were not farmers or manufacturers; they were bureaucrats, scholars, and functionaries. Trantor produced nothing but laws, decrees, and order. It was entirely dependent on the "Outer Worlds" for food and resources, with thousands of ships arriving daily to feed the insatiable hunger of the capital.
Life Beneath the Domes
Life on Trantor was stratified, literally and metaphorically. The closer one lived to the Imperial Palace and the surface, the higher one's status. Deep beneath the surface lay the "Heatsinks," massive geothermal power stations where millions toiled to keep the city running.
Despite its artificiality, Trantor was not without beauty. The Imperial Library was the repository of all human knowledge, and the Imperial Palace grounds were vast enough to contain gardens, mountains, and seas—all artificial, yet perfect.
Dependency Vulnerability
The fatal flaw of Trantor was its absolute reliance on external supply lines. A siege of Trantor did not require weapons; it merely required a blockade. When the Empire began to fracture, this dependency turned the capital into a tomb.
The Fall
Hari Seldon, the founder of Psychohistory, foresaw the fall of Trantor centuries before it happened. He predicted that the complex systems holding the Empire together would degrade, leading to rebellion, chaos, and the eventual sacking of the great library.

The "Great Sack of Trantor" by the rebel Gilmer marked the definitive end of the Galactic Empire. The metal domes were breached, the heating systems failed, and the billions who could not flee perished. The once-great capital was reduced to an agrarian backwater, its survivors tearing up the metal plates to plant crops in the soil beneath. They eventually renamed their world "Hame" (Home), forgetting the glory that once was.
Trantor serves as a powerful reminder: no matter how high we build, any civilization built on fragile foundations is destined to crumble.

