The Empire controlled planet Bespin is a gas giant that isabout 118,000 kilometers in diameter. Like most gas giants, it has a solid core made of metal followed by layers of metallic gases. Most of the layers of gas are poisonous, and the pressure and temperature are far above what a Human could tolerate. But from approximately 150 to 180 kilometers down from space, there is a habitable layer known as the Bespin Life Zone. This layer has an oxygen atmosphere with temperature and pressure suitable for Human life. It is in this layer that Cloud City is located. Like most gas giants, Bespin has a number of moons. It has a twelve-hour day, and completes a revolution around its sun about every fourteen years.