The Akatsu, physically distant ally of The Geist and Valentians, hail from a trinary star system once known as Rigil Kentaurus. Akatsu is the primary star and hosts the inhabited planets, Hiroshi and Hayashi whose inhabitants call their primary "The Daylight Sun", its Akatsu name literally translating to "Dawn". Hiroshi is an ocean covered world with less than twelve percent land surface and is home to the Emperor's Palace and The Extent's first floating city, Yori. The Akatsu have been expanding in recent decades, primarily into Tayjekan territory. Akatsu, reliant on imports to drive their increasingly mechanised economy, have recently been expanding into Zuìzhōng territory.
The Solar System, the birthplace of humanity and the ancestral home of every human across known space, has more populated planets and moons than any other system. More than half the human race still live on Earth and a further ten percent are spread throughout the system. Sol's people, the moon included, are a homogeneous mix of racial and national types but most of the colonised planets and moons have specific racial or national biases.
The Skean alliance is composed of Saxonia, Ayra, Kanata, Darug and Wayata a total of twenty planets across ten systems. Although something of a fading power, the Skean Republic remains the most powerful alliance in The Extent.
The United Colonial Systems or UCS are a group of planets that have merged into one nation and the Star and Crescent Moon banner. The alliance has expanded recently with the addition of the Ice System, Isthma and, most recently, Aumakua bringing the total number of planets to twenty-two across twelve distinct systems.
The UCS planets vary considerably in character from the northern libertarians to the western technocrats and the southern conservatives. The frigid wastes of Purgatory in the Ice System as well as the tropical climes of Isthma and Aumakua server to provide still more variation.