The rule

Summary of the book Isaac Asimov for more than twelve thousand years the Galactic Empire ruled the entire galaxy, millions of inhabited planets from the heart of the galaxy, the capital Trantor, to the outer galaxy. A world called Harry Seldon uses the science of psychohistory to predict the future, to see the decline of the Galactic Empire, and eras of darkness, barbarism, and ignorance will last for thirty thousand years following the collapse of the Empire. To preserve human sciences and reduce the barbaric period to only a thousand years, Harry Seldon gathers the best minds of the galaxy to establish a base on a desolate planet at the far edge of the galaxy, the planet Terminus. Soon the base finds itself surrounded by enemies greater than its ability to confront, barbarian kingdoms that have split from the Galactic Empire, and behind them dangers and crises threatening the base and Harry Seldon’s plan for the future of humanity.