"You know, in the future, we won't sit and read newspapers in the morning. Instead, giant robots will control us in human death matches." -Doofenshmirtz, episode "Nerds of Feather"
The main star Ametra is an anomalous aka a miraculous star. The star is extremely massive (about 40 times the mass of the yellow dwarf Daizou, who provided light and energy to early humans on Zanam), yet unlike other known stars of similar size, it is very metal rich and has been there for billions of years, providing a stable anchor for the other suns in the system. The ancient humanity was right to recognize Ametra as the "Queen of The Sky".
Surrounded by the Great Disc, large expanse of hot dust and particles that revolves around Ametra, home to the irradiated and bombarded world of Acheron, that probably emerged from collection of dust and particles.
Orbiting from a great distance is the second planet, the gas giant Caelum and it’s three moons. Caelum and it’s moons are ruled by the Holy Commonwealth, with the sacred moon Merida as their capital. Caelum system is filled with most extensive and fully maintained orbital infrastructure in the entire cluster, especially their Antimatter extractors around Caelum. Caelum is seldom welcome to outsiders. However, they do offer tech maintenance services and knowledge to those paying a very hefty price or at least in some rare occasions, allowed to operate missionaries and charities on their client’s realms.
The second planet is the ringed gas giant Vesper and it’s two moons, the Earth sized world of Lengashar, a world of dunes and dragons, and the abandoned derelict rich airless moon of Obolus. Vesper and Lengashar are filled with extensive and fully maintained orbital infrastructure, though some are abandoned due to many millennia of age, damage, or just failure to maintain the ancient technologies onboard. Due to the Commonwealth's strict isolationism, the market on antimatter and other trade of coveted resources beyond Imperial space is cornered by the ruling global coalition of Lengashar, the Union of Lengashar.
The second star orbiting Ametra is Daizou, an yellow dwarf surrounded by an ancient, failing dyson swarm. The Daizou system, the cradle of humanity for countless eons, is now under the rule of the 5th Grand Empire of Ametra, more commonly referred as the Imperial Federation, ruling from the capital world of Zanam, the homeworld of humanity. It has called the Imperial Federation since the notorious Tiamat Rebellion, which ended in the Treaty of Shambala that lead to vastly increased autonomy for imperial territories and vassal states, as well as stripping almost all power from the position of the Emperor/Empress.
The Imperial Federation is currently an extremely diverse civilization, with countless cultures and polities under it. The real power behind the Imperial Federation are the megacorps, the Imperial Ministry of Defence, and most shamefully, the Fuel Barons of Shambala, the descendants of the very rebels who lead rest of their lunar breatherns to fight their Zanami overlords, only for them be enslaved by their own lunar neighbour.
The third and fourth stars orbiting Ametra are Yellon and Gryse, twin red dwarfs locked in a binary orbit. They are surrounded by the Twins’ Belt, a large asteroid field, filled asteroids, planetoids, and orbital infrastructure both functioning and wrecked. Twins’ Belt is ruled by what many collectively call the The Ten Thousand Stone Tribes, thousands of mysterious independent orbital colonies who seldom leave the belt, except for a rare trading or raiding expedition. As far as anyone is considered, tribes probably sees no difference between the two words.
The first planet in Yellon-Gryse Gas Giant Heng, home to the two allied moons, the earth sized moon Kordon (a world of great oceans, where people live on islands or on giant sea fleets) and the jungle moon of Tallgarden (a world where the people live in fortifide enclaves under the shadows of trees taller than hills and great ancient megastrues that even dwarf the native trees). There exists, extensive orbital infrastructure on Kordon, Tallgarden and Heng (antimatter and gas extraction), though many of infrastructure are only partially working at best. It is a popular myth among the people of Kordon and Tallgarden that they were descendants of whatever civilisation ruled the moons of Crasus (most people believe them to be part of the 3rd or early 4th Grand Empire of Ametra, though has been growing evidence pointing it to be a fully independent civilization from the start).
The gas giant Crasus and it's moons are the graveyard of the Ametra system, haunted by abandoned megastrues, dead colonies, mutants, and rogue machines. Only the most foolhardy or desperate ventured their for treasure or knowledge. That somewhat changed when Lady Zia, a Lengashar business mogul, spend most of her wealth setting up a colony on the moon of Greyscar. Initially seen as an act of madness, soon other wealthy oppertunists and their most desperate thralls began to settle on Greyscar. Greyscar is now ruled by fortress-city states governed by "Scavenger Lords", each using their subjects to explore and loot advanced technologies for them, as well as fighting and general labour. Often times these subjects would defect from their lord and hide among the ruins, becoming bandit rebels, eventually overthrowing a lord and taking over as an new tyrannical lord.
Later explorations revealed that the Martians, who were in a mid-20th century tech level, fought over last remaining habitable zones and resources as the full effects of Mars's gradually decaying magnetic fields are revealed, dooming Mars into becoming the dry and cold world we know now.
I belive these discoveries would have a major impact on humanity, not only about the question of life outside Earth, but more pressing concerns like possibility of Nuclear Armageddon and Climate Change.
Daizou: Orange dwarf.
Yellon and Gryse: Twin red dwarves locked in a binary orbit.
Ametra: white mini quasi-star (about 30-40 solar mass) that serves as the main star of this system.