Because scope creep is a fact of life, I’ve been tinkering with several ideas to give some additional detail for the rest of known space outside of the Foross Sector, which has become heavily inspired by the Tales of the Jedi and Knights of the Old Republic comics.
Since I am always bad with names and leave that up until the very last moment (or never), I’ve been using the names of Star Wars planets that are similar to what I have in mind for the various worlds of Iridium Moons. Might always give Star Wars nerds like me some reference for what you might be looking at.
As Space Opera settings go, Known Space of Iridium Moons is rather small. It covers only a short segment of a single spiral arm. The low density of stars and lack of abundance of heavy elements outside the spiral arm has channeled exploration and colonisation away from the galactic center and into the more dense regions towards the galactic edge from the core systems. There are at least dozens and perhaps even hundreds of small colonized planets with populations numbers in the thousands, which are not shown on this map at this stage. The exception are the planets of the Foross Sector, which are the main focus region that almost all of my specific detail work goes into. Which are in the center top of the map.
Unlike Star Wars, Iridium Moons does not have one big Galactic Empire, or even an Old Republic and a Sith Empire facing off in an epic struggle for control of the entire galaxy.
The Directorate of United Systems (blue) is a federation of four homeworlds and five major colonies over 100 million inhabitants, that each have complete autonomy over their local internal governance and planetary defense, plus a large number of minor worlds with varying forms of dependency on the major worlds. Each of the nine worlds elects a delegate to the Directorate that is in charge of all diplomacy, economic policy, and the Directorate Navy.
The Confederated Worlds (red) is a more loosely organized block of largely self-governing worlds. While in theory a community of equals, the economic, industrial, and military dominance of the enkai homeworld gives its government the power to largely dictate policy to the other member worlds. The worlds of the confederation maintain their own fleets and ground troops, but all are integrated into a single command structure under the High Command.
The Star League (green) is purely a defensive alliance of fully sovereign states. It is centered around the chosa homeworld, which has long resisted any efforts to be pulled into the Confederated Worlds, with a number of other neighboring worlds making considerable concessions to the chosa to gain an insurance against falling under confederate control.
The three great blocks see each others as rivals and competitors, but are all engaged in large scale trade with each other. None of them want to deal with the enormous costs and unpredictable risks of a full scale war between them, and instead are always looking for every possible opportunity to gain a more advantageous position over the others that will give them greater leverage in trade negotiations and relationships with minor worlds. None of the three great powers have ever attempted to land ground forces and occupy member worlds of the other powers, but the stopping and confiscating of ships, raids against orbital infrastructure, and blockades of planets happen somewhere along the borders every few years or so for some reason or another, which all sides understand to be mostly saber rattling to force concessions in some dispute or another.