The Sol System

The Sol System (pronounced SOLE Sis-TEM), also known as the Terran System, the Origin System, or the Solar System, is the birth system of Mankind and the eventual principal seat of the Stellar Imperium within the Milky Way Galaxy. The system is named after its sun, Sol, and lies at the direct astrocartographic center of the Proxima Solar. At least in the majority of Galactic maps drawn up by the Empires and Societies of Humanity.
The Sol System is part of the Sol Sector and Hearth Sector, respectively. Its primary planets including the birth world of Humanity in Terra, the transformed Anchor World of the Rift-Net, and Humanities communication networks found within Mars as well as the Economic and Technological Giant of Jupiter. There are a total of nine major planets and many dwarf planets within the Sol System, some of which are also orbited by heavily-settled moons, such as Luna, the Martian Twins--Deimos and Phobos, Ganymede and Others.
== Overview ==
The birthplace of humanity would be upon the planet Terra, and with their Ascension in the following millennia, the Sol System would be near-fully colonized by humanity by late M20. And during the Technological Golden Ages that followed humanity would expand across the stars thanks to the invention of Void-Core SRM Drives and the evolution of the inhuman Wayfinders, and in this period the Sol System was dominated by the mighty Empires of Man of which coexisted peacefully. 
Upon the cradle of Terra and through a most mortal set of trials and tribulations, humanity would rise as a predominant force upon the lands of Old Terra, and with their Ascension and subsequent growth in the following millennia, the Sol System would be near-fully colonized by humanity by late M20. And during the Technological Golden Ages that followed, humanity would slowly expand across the stars. And eventually their efforts would triple thanks to the invention of Void-Core SRM Drives and the evolution of the psychically sensitive and inhuman Wayfinders, and in this period the Sol System was dominated by the mighty and growing Empires of Man of which would coexist peacefully for the near 44 Millennia of the Golden Ages of mankind. 
Yet with the onset of the Long Dark, and the birth of the Stygian Veil and subsequent radio silence from the wider Galaxy, the Sol System fell into complete anarchy. And for ten Long Millennia, the Civil Capitals of Terra, Venus and Mercury would collapse into terrible wars between the newborn Techno-Barbarian Clans and their Despotic Warlords whilst the Information Hub of Mars reverted into a most complete and terrible isolation, its Orbital Guns poised to fire down any who dared to land. The Titan worlds, Saturn would go silent even as Anarchy reigned upon its moons whilst the once Honored Machinists of the O' Noble Titan Jupiter would devolve into bickering warlords devoted to the religious worship of technology and profit. 
Uranus, once a distant outpost in the Sol System, became a fractured realm during the Long Dark. The gas giant and its moons fell victim to internal strife and external invaders. Rebel factions, both ideological and opportunistic, carved out territories on various moons, leading to a patchwork of warring domains. Uranus quickly became a battleground for bickering rival factions, each vying for control over the planet's vast resources. The icy giant of Neptune would bear witness to no less of a cruel fate during the Long Dark. For as the chaos spread across the Sol System, Neptune's vast oceans became a mysterious and foreboding expanse as its colonies were crushed under the weight of its oceans. Techno-barbarian clans, drawn to the allure of ancient secrets rumored to be hidden beneath the icy surface, waged war for control over Neptune's moons and subaquatic realms. The planet became a battleground between those seeking forgotten knowledge and those wishing to exploit its mystical depths for power.
Once a bustling highway of trade and commerce, the Asteroid Belt descended into lawlessness during the Long Dark. Void-Core SRM Drives, once the key to humanity's interstellar expansion, became both the prize and the weapon of the ruthless warlords who claimed the belt as their domain. Pirates, scavengers, and rogue factions roamed freely, engaging in skirmishes over resource-rich asteroids and ancient derelicts. The once orderly lanes of commerce became perilous routes, navigated only by the boldest and most desperate. Pluto, the dwarf planet at the edge of the Solar System, became a frozen outpost isolated from the chaos consuming the inner planets. Its icy surface and distant location spared it from the worst of the conflicts, but it also left Pluto in a state of desolation. The inhabitants, if any remained, faced the harsh realities of survival in the frigid expanse. The planet became a forgotten relic, a distant memory of humanity's once grandiose expansion into the cosmos.
Death and carnage would reign for Ten Thousand years as the Stygian Veil wrapped like a noose around the neck of Sol. Yet salvation would only come upon the Wings of Fire that heralded the coming of the Emperor, who unified Terra, and then the entire Sol System into the fledgling Stellar Imperium during the Unification Wars and subsequent Origin Wars.
== Notable Planets ==
* Mercury (Mining World) - Mercury is a small, Geo-Engineered World and a High-Priority Mining Outpost that orbits very close to Sol. Despite its unforgiving desert conditions, shoal facilities operate in Mercury's high orbit. In ancient days pass large orbital atmospheric-pulse Rods in tandem with Ancient Archeotech World-Engines forged Mercury into a habitable world, wherein Humanity heavily colonized the planet during the early millennia of the Golden Age of Technology. During the Dark Ages of the Long Dark, Human Society devolved into civil war and strife, wherein much of the technology needed to maintain the atmosphere was destroyed - leaving the world a near-inhospitable desert-scape. By the Opening Years of the Reclamation Wars, Mercury had been 
* Venus Industrial World - Venus, once a rocky body with the densest atmosphere among its rocky cosmic neighbors, transformed dramatically during the Golden Age of Technology. Under the cutting knives of World Engines and Atmospheric Pillars, Venus shed its toxic atmosphere and became a paradisiacal haven. C-Dioxite, an alchemical neo-material, emerged as a testament to Venus's transformation. Lightweight, flexible, and hyper-conductive, C-Dioxite would shape Venusian civilizations through the millennia of the Long Dark. Serving as protection against Ionized Sulfuric Hurricanes, the cataclysmic storms that periodically swept the planet, crackling with sulfuric lightning.
* Terra (Spire World / Throneworld) - Terra is the Throneworld of the Imperium of Man and the original homeworld of Mankind and the Emperor. It is the most sacred and revered place in all the million worlds that comprise the Imperium. Terra is an ecumenopolis, a single cityscape straddling the entire planet, with its vast Spire cities covering the entirety of its surface. It is home to hundreds of billions of people and visited annually by tens of billions more seeking to complete religious pilgrimages to the world that their God-Emperor calls home.
** Luna (Dead World / Civilized World) - Luna, Terra's only natural satellite, is a densely settled Civilized World of the Imperium. Its massive population lives in great cities built deep below the lunar regolith.
* Mars (Conduit World / Fortress World) - Once a technological marvel with bustling Information Hubs, Mars has devolved into isolation during the Long Dark. Its orbital guns stand vigilant against intruders, while the surface remains shrouded in mystery, home to ancient technology and dormant war machines.
* Jupiter (Forge World / Guild World / Docking World) - The once-honored Machinists of Jupiter's O' Noble Titan have devolved into bickering warlords, turning their focus from technological advancement to religious worship. The gas giant's immense gravity well conceals vast refineries where remnants of the past's technological glory are exploited for power and profit.
* Saturn (Death World / Colony World) - Saturn's moons have fallen into anarchy as void-faring scavengers and opportunistic warlords clash for control. The once orderly Ring Mining Stations have become lawless outposts where resources are fought over amidst the shattered remnants of ancient megastructures.
* Uranus (Death World) - Uranus has become a fractured realm, torn apart by internal strife and external invaders. Rebel factions battle for control of moons, creating a patchwork of warring territories on this distant outpost.
* Neptune (Ocean World / Death World) - Neptune's vast oceans hide ancient secrets beneath the icy surface. As techno-barbarian clans war for control, the planet becomes a battleground between those seeking forgotten knowledge and those exploiting mystical depths for power.
* Pluto (Dead World) - Isolated from the chaos of the inner planets, Pluto is a frozen relic at the edge of the Solar System. Its inhabitants, if any remain, face the harsh realities of survival in the frigid expanse, a distant memory of humanity's once grandiose expansion into the cosmos.
=== Solar Bodies ===
* Asteroid Belt (Colony System) - Once a bustling trade route, the Asteroid Belt is now a lawless expanse. Pirates and rogue factions roam freely, engaging in skirmishes over resource-rich asteroids and ancient derelicts in a perilous region where commerce has given way to chaos.