{{redirect|Solar|the [[Macharian Sector]]'s currency|Imperial Currency}}{{redirect|Solar system|the general term for a set of objects orbiting a star or stars|System}}{{GalaxyPortal}}{{ImperiumPortal}}The '''Sol System''' or '''Terran System''' is the name of the [[Wikipedia:Solar System |Solar System]] in the [[Age of the Imperium]]. The system is named for its sun, and is part of the [[Segmentum Solar]]. Its planets include Holy [[Terra]] and [[Mars]].

Known ==History==The birthplace of humanity on the planet Terra, the Sol System was fully colonized by humans by [[M15]].{{Fn|6}} During the [[Imperial GuardDark Age of Technology]] humanity expanded across the stars thanks to the invention of [[RegimentWarp Drive]]s based and [[Navigator]]s, and in this period the Sol System include was dominated by the empires of Terra and Mars which coexisted peacefully.{{Fn|7}} During the [[Palatine SentinelsAge of Strife]], the Sol System fell into complete anarchy. Terra collapsed into wars between [[Techno-Barbarian]]s while Mars reverted to complete isolation and religious worship of technology.{{Fn|8}} Salvation only came with the coming of the [[Lucifer BlacksEmperor]], who unified Terra, Mars, and then the entire Sol System into the fledgling [[Imperium]] during the [[Jupiter StormsUnification Wars]] and [[Great Crusade]].{{Fn|7}}  During the subsequent [[Horus Heresy]], the Sol System was the site of bitter fighting between loyalists and traitors during the [[Auroran RiflesSchism of Mars]]and [[Solar War]]. At the final phase of the war [[Horus]]' forces succeeded in capturing the Sol System and besieged Terra itself, but were eventually defeated and repelled during the [[Granite MyrmidonsGreat Scouring]]. Since that time, the Sol System has not been the site of all-out war though it did see fighting during the [[Inferallti HussarsWar of the Beast]]{{Fn|9}}, [[Orion WatchAge of Apostasy]]{{Fn|10}},and recently the [[Battle of Lion's Gate]].{{Fn|111}} The System was also saw a minor but mysterious [[Necron]] raid on Mars in late [[M41]].{{Fn|12}} During the [[Noctis Aeterna]] the Sol System was threatened by the [[Khornate]] [[Crusade of Slaughter]] but subsequently defeated by an [[Indomitus Crusade]] fleet under [[Cassandra VanLeskus]].{{Fn|13}} In addition, [[Ganymede (Moon)|Ganymede]] became infested with [[Daemon]]s and potentially the [[Terran PraefectsGrey Knights]]were forced to purge the planet.{{Fn|14}}

== Planets Celestial Bodies==There are nine planets in [[Image:SolarWarMapBig.jpg|thumb|right|Map of the Sol System]]*'''Sol''' - The singular [[Star]] of the system, some of which are also orbited by notable moons:*[[Mercury]]- [[Mining World]]{{Fn|3}}*[[Venus]]- [[Industrial World]]{{Fn|3}}*[[Terra]], and its moon, - Throneworld of the [[Imperium]]**[[Luna]]- Moon of Terra*[[Mars]], - [[Forge World]] and its moons, capital of the [[DeimosAdeptus Mechanicus]] and **[[Phobos (Moon)|Phobos]]- Moon of Mars*'''Asteroid Belt''' - Holds an innumerable amount of mining facilities and space colonies.{{Fn|17}}**[[Ceres]] - Dwarf Planet{{Fn|2}}*[[Jupiter]]- [[Forge World]]/[[Mining World]]{{Fn|3}}**[[Ganymede (Moon)|Ganymede]] - [[Hub-Fortress]]{{Fn|14}}*[[Saturn]], and its moon, - [[Inquisitorial Fortress]]{{Fn|4}} **[[Titan (Moon)|Titan]]- Moon of Saturn and [[Adeptus Astartes Homeworld|Homeworld]] of the [[Grey Knights]]***[[Deimos]] - Sub-moon of Titan (previously a moon of [[Mars]])**[[Enceladus (Sol)|Enceladus]] - Moon of Saturn.{{Fn|2}}**[[Phoebe]] - [[Forge-Moon]] of Saturn.{{Fn|18}}

*[[Kuiper Belt]] - An asteroid belt beyond Neptune with various dwarf planets.**[[Pluto]]- Dwarf Planet***[[Khthonic Gate]] - One of the two stable [[Warp]] routes into the Sol System built during the [[Dark Age of Technology]].{{Fn|5}}**[[Makemake]] - Dwarf Planet{{Fn|2}}**[[Eris]] - Dwarf Planet{{Fn|2}}

Other celestial regions or objects in of the Sol System include the [[Oort Cloud]],{{Fn|16}} [[The Comet]] and [[Artefact 9-Kappa-Mu]]. ==Defences==As the centre of the Imperium, the Sol System sports the heaviest known defences in the [[Galaxy]]. At the very edge of the System near the [[Mandeville Point]] are arrays of [[Star Fort]]s garrisoned by [[Regiment]]s of the [[Imperial Guard]]. The rest of the outer System is densely laced with thousand-mile-wide minefields, [[Imperial Navy]] patrol monitors, and enormous [[Hunter Servitor]]s. Past these is the core defences of the system, most notably the enormous [[Battlefleet Solar]] of the Imperial Navy. In addition to these forces, the [[Grey Knights]], [[Inquisition]], [[Adeptus Mechanicus]], and [[Adeptus Arbites]] all have substantial forces in-system deployed through endless bases, stations, and garrisons. At Terra itself orbits the massively powerful [[Imperial Fists]] battlestation known as ''[[The Phalanx]]''. Due to the massive daily influx of zealots, adepts, bureaucrats, merchants, pilgrims, and the like, daily security is screened heavily by the [[Adeptus Custodes]]. The Custodes maintain surveillance stations and listening devices throughout the System.{{Fn|3}} Known [[Imperial Guard]] [[Regiment]]s based in the Sol System include the [[Palatine Sentinels]], [[Lucifer Blacks]], [[Jupiter Storms]], [[Auroran Rifles]], [[Granite Myrmidons]], [[Inferallti Hussars]], [[Orion Watch]],{{Fn|1}} and potentially the [[Terran Praefects]]. Known [[Star Fort]]s in the Sol System include the ''[[Oracle Maximus]], [[Prescience (Star Keep)|Prescience]], [[Taon Aegis]]'' and ''[[Eyrie Prime]]''. These are overseen by the [[Adeptus Custodes]].{{Fn|15}}

*{{Endn|1}}: [[The Hunt for Vulkan (Novel)]] , Chapter 4*{{Endn|2}}: [[The Solar War (Novel)]] - ''Map''*{{Endn|3}}: [[Codex: Adeptus Custodes (8th Edition)]], pg. 29 — ''Sol System''*{{Endn|4}}: [[The Beheading (Novel)]], Chapter Fifteen*{{Endn|5}}: [[The Solar War (Novel)]], Chapter 2*{{Endn|6}}: [[Galaxy in Flames (Novel)]]{{Cite Marker End}}, pg.280*{{Endn|7}}: [[Codex Imperialis (Background Book)]], pg. 42*{{Endn|8}}: [[Codex: Skitarii (7th Edition)]] - ''The Red Planet''*{{Endn|9}}: [[Throneworld (Novel)]], Chapters 4-5*{{Endn|10}}: [[Codex: Sisters of Battle (2nd Edition)]], pg. 13*{{Endn|11}}: [[Warhammer 40,000 8th Edition Rulebook]], pg. 50*{{Endn|12}}: [[Codex: Necrons (3rd Edition)]], pg. 11*{{Endn|13}}: [[ White Dwarf July 2019]] - ''Indomitus Crusade Fleets''*{{Endn|14}}: [[White Dwarf November 2019]], pg. 47*{{Endn|15}}: [[Codex: Adeptus Custodes (9th Edition)]] pg. 12*{{Endn|16}}: [[The Horus Heresy Book Nine - Crusade]], pgs. 81-100*{{Endn|17}}: [[Ashes of the Imperium (Novel)]] - Chapter 26*{{Endn|18}}: [[ Journal Tactica: The Forges of Saturn]], pg.3