Planet Rylos is home to Starfighter Command, a Star Leauge Member, homeworld of the Rylan species. It has one moon named Galan, often called the "Green Moon of Galan".
It is attacked by Xur and the Kodan Armada with meteor guns and Starfighter Command is destroyed and all of the starfighters are killed, except for Alex who had chosen to return to Earth.
Rylos seems to have many automated systems to make life as simple and as comfortable as possible. It is a technologically advanced planet with moving walkways and many tall platforms for the landing and embarcing of alien space craft.