From Lexicanum

Map	Basic Data		Planetary Image
	Name:	Mars
	Segmentum:	Solar
	Sector:	Unknown
	Subsector:	Unknown
	System:	Sol
	Population:	20,000,000,0003
	Affiliation:	Imperium
	Class:	Forge World
	Tithe Grade:	Aptus Non

Information

Mars is the 4th planet of the Sol system. It is the domain, headquarters and principal Forge World of the Adeptus Mechanicus.

The "Red Planet" as it is called, is acclaimed as a wonder of the galaxy. In the early 22nd century it became the first planet to be terraformed by humans. After being made habitable, the planet was settled by industrial cartels, and it soon developed into the first hive world and a center of industry and scientific advancement.

In the Age of the Imperium, Mars is home to untold billions of servitors and the Cult Mechanicus tech-priests, the devoted servants of its techno-arcane Machine God. The planet is covered in sprawling hives reaching miles into the Martian sky and their foundations delving deep into the planet's core. Orbital factories circle the equatorial belt, their ceaseless industry forming a glowing halo around the planet.

Mars is the home of the mightiest fleet in the Imperium, the Battlefleet Solar; above the equator vast space docks float in geo-stationary orbit. Mars serves as the Segmentum fortress of Segmentum Solar, and is the home world of several Titan Legions, including the Legio Ignatum.^{1, 2}

Some rumours tell that the C'tan the Void Dragon resides deep under Mars' surface. Another rumour, though strictly rejected by the Iron Hands, says that Ferrus Manus survived the Isstvan V massacre and now resides on Mars.³

Sources

• ¹:White Dwarf 178, The Titan Legions, by Rick Priestley
• ²:Codex Imperialis, p. 42
• ³:Codex: Necrons (3rd Edition)