Titan is the largest moon of Saturn, the sixth planet in the Sol system. It is also the second largest satellite in the Sol system, and the only such body to have a dense atmosphere, and is larger than some planetary bodies in the solar system. By the mid 21-st century, Humans had established a series of domed settlements on Titan, including Christopher's Landing. This colony became a safe haven as Earth was ravaged by World War III. The colony also became a safe haven to several Jinda and Tulgah slaves who were freed from the Inkersians.