Chapter 10 guide

Trantor...the capital of the First Galactic Empire...under the reign of Cleon I, it radiates the "Evening Light of Dusk".By any measure, that was its heyday.Its 200,000,000-square-kilometer surface is completely covered by the dome (with the exception of the area around the palace), and beneath the dome is a sprawling metropolis that extends below the continental shelf.The population at the time was 40 billion, and although (looking back at history it's obvious) there were plenty of signs of problems, the people of Trantor heartily regarded it as the fabled "eternal world" and never imagined that it would one day be...  

—— "The Complete Book of Galaxy Materials"