Centrum System

The **Centrum System** is a gravitationally-bound planetary system in the Tantalus Cluster, containing five planets and an asteroid belt. The capital system of the Centrum Assembly, it is the original system of humanity, which evolved on the eponymous planet Centrum.

## Description

Orbiting around the star Centrum Solaris, the Centrum System contains five planets and eight moons. Expanding from the ocean planet of Centrum, humanity has extensively colonised the system, with settlements established on the Centran moons Lysane and Lysara and the neighbouring planet Destrum; a gateforge established at the ice giant Hadimus; and diplomatic facilities established at the gas giant Arasin Maxima.

Drift Gates link the Centrum System to four other planetary systems - Pioneer Keeper's Dance, Rialtis, and Valeria Sibus.

## History

Humanity evolved on the planet Centrum, developing numerous nation-states and ultimately launching several scientific expeditions to the planet's two moons, Lysane and Lysara. One such expedition discovered the material known as Drift on Lysara. Centran science was revolutionised when Drift's unique gravitoelectromagnetic properties were discovered, and its implications for space travel meant that the planet's nations unified over a period of three years, forming the Centrum Assembly. The year 0001 PCU (Post-Centrum Unification) became the epoch for humanity's dating system.

With the development of fast, efficient fusion-powered Drift Drives, from 0005 PCU the first Drift-powered spacecraft began to chart and settle the worlds of the Centrum System. An early conflict in humanity's period of colonisation was the Arasinian Commerce War provoked after the corporations of Savaragi Industrial and Rota Excavations withheld Drift from Centrum and formed the Savaragi-Rota Alliance. Numerous skirmishes between the SRA and the Centrum Defence Force took place around Arasin Maxima before the SRA was defeated at the Battle of Lyrion Point.

In 0010 PCU, the Hadimus Gate Forge was established at the ice giant Hadimus to develop the first drift gate, enabling the settlement of the Pioneer System in 0017 PCU.

Over hundreds of years, the cities of Centrum merged into a single planet-wide city, though still maintaining large areas of greenery and oceans. In its heyday, Centrum was considered a beautiful planet. Since the Great Famine and the Frontier War, however, the planet lies in disrepair, with many of its people starving and non-essential structures largely abandoned for salvage.

In 0300 PCU, die-hard remnants of the Frontier Union Militia attempted to seize the Drift Gate at Atamara Crossroads, intending to use it to accelerate an asteroid to faster-than-light velocities to destroy Centrum in a final act of defiance. They were thwarted by Centrum Assembly forces in the Battle of the Atamara Crossroads, the final battle of the Frontier War.

## Layout

### Gravitational governor

* Centrum Solaris - A-Type Main Sequence star

### Planetary bodies

* Hadimus - Hot Ice Giant
	+ Igari - Hot Rocky Moon
	+ Hadimus Gate Forge - Orbital Construction Yard, now decommissioned
* Centrum - Naturally Habitable City Planet
	+ Valentina's Reach - Orbital Spaceport
	+ Lysane - Non-spherical Rocky Moon with numerous domed cities
	+ Lysara - Temperate Rocky Moon with numerous domed cities

* Destrum - Partially Habitable Dust Planet
	+ Destrum Terminal - Orbital Spaceport
	+ Ferrin - Dusty Moon

* Centrum Asteroid Belt

* Arasin Maxima - Class II Gas Giant
	+ Lyrion - Frozen Ice Moon
	+ Carida - Craggy Moon
		- Harmony Station - Orbital Embassy
	+ Vela - Frozen Volcanic Moon

* Iona - Frozen Ocean Planet
	+ Spyglass Station - Deep Space Sensor

### Drift Gates

* Centrum - K. Dance Drift Gate - Hadimus-Centrum Solaris Lagrange 4
* Centrum - Rialtis Drift Gate - Centrum-Centrum Solaris Lagrange 4
* Centrum - Pioneer Drift Gate - Destrum-Centrum Solaris Lagrange 4
* Centrum - V. Sibus Drift Gate - Arasin Maxima-Centrum Solaris Lagrange 4

## References

1. ↑ 1.0 1.1 1.2 1.3 The Sojourn: Worlds of Tantalus: The Centrum Assembly
2. ↑ 2.0 2.1 2.2 The Sojourn: Drift and Drift Gates - Avalon Archives
3. ↑ 3.0 3.1 *The Sojourn Visual Dictionary - Edition One*

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