Neptune

Neptune was a major pub of entertainment and beauty, and another center for orbital cities and even more populated than Saturn, with a population of nearly two million. It's attractiveness was due to the blue aura it's cities remade, and was a relaxing and "chill" (as the people said) planet, with little troubles and activity occuring.

Geography
A major deposit for the gas known as Vilitilitaniulium, a major ingredient for the fuel used for starships, it was first a mining planet, with several private monopolies mining it's atmosphere.

Political
The largest orbital city was known as Placidus, and was also the capital. Other major cities were Chloro, Aluua, Terek, Bental, and Sivilian.