Eos (Cosmoria)

As far as stars go, Eos numbers among the smallest in Cosmoria. At just 200,000 km across, its habitable zone lies a mere two million kilometers from its surface. Under normal circumstances, this star would have a population somewhere in the billions, a mote on the scale of Cosmoria's civilizations. Eos, however, is not a normal star for surrounding it is a megastructure dwarfing nearly all others. This massive structure is a large flat disk orbiting this dwarf star. On this disk reside hundreds of trillions, environments unseen anywhere else, and some of the most influential empires in history.

The gateway from Aylathiya to wider Cosmoria, Eos lies in the center of Martial Space. An economic powerhouse: merchants, companies, and governments often use the large structure as a staging ground for their commerce of all kinds. Underneath the trade-friendly orderly surface is an eternal conflict as dozens of factions strive to take advantage of Eos' lucrative position. A gilded world, the guise only occasionally disappears. When it does disappear, however, it disappears with great force, leaving the rest of Cosmoria suffering generation-defining recessions at best.

Nearly every group imaginable takes credit for the creation of Eos, from the Dotsk who have a reputation for building mega-structures, to nationalists in Florathel that claim only the Lareas Alliance could have created the structure. Historians on Eos sometimes credit its creation to Ohko's Civilization, but they just as often credit the First Aeterna Society. Regardless of the origin, it has continually existed for 2 to 4 million years, likely taking much of this time to construct. It is technically unfinished, as a large section of the structure has never been filled in.

The world remained a backwater on the galactic stage until the rise of the Triumvirate Civilization 200,000 years before the present day. This civilization's meteoric rise caused Eos' population to balloon to over a quadrillion by 15,000 BCE. When the Triumvirate fractured as its three leaders went their separate ways, the resulting war caused its population to dip below one trillion, resulting in a galactic recession that has still technically not ended. From then, Eos has continually united and fractured until the modern day, currently existing united under the Greater Martial Consilium.

Physical

Structure

Eos is currently three million kilometers in radius and has a surface area equal to 25 trillion square kilometers. Embedded within this structure is a series of large orbital rings ranging in size from 1000 km to 1300 km. Within them, small charged black holes race around the star at relativistic speeds, their momentum cancelling the force of gravity to prevent the disk from collapsing into the star.

With a mass of 0.5 M_☉ it takes a vast amount of energy to maintain the structure. Energy produced by a series of black holes located throughout Eos more than provide enough power for this. These objects, the size of atomic nuclei at the largest, produce more energy than the star itself just to maintain the disk. While the black holes seem dangerous, they are highly charged and therefore easily magnetically confined. Even direct strikes against them represent a trivial threat, especially given how every organization, government, and nation in the history of Eos would stop at nothing to protect them.

The disk is not quite flat, it gently angles upwards to form a concave structure. The reason for this is simple; it keeps gravity uniform and "downwards" across the whole of the disk. Were it perfectly flat, gravity would pull towards the center, straining the orbital rings as well as making life impossible on its surface. The disk thickens as the distance to the star increases. It has 0.01% grade, resulting in only a minute slope in its surface.

Climate

A mere one million kilometers away from its star lies in the innermost region of Eos. This area, with an average temperature of 500 Celsius, possesses large seas of lead. For the past 200,000 years, large mirrors have exited above Eos to concentrate light onto Orcubor settlements, creating regions of over 2000 degrees Celsius. These hellish regions threat the very structural integrity of the disk, requiring extensive cooling systems maintained by whichever government controls Eos.

Further out lies an area that is too hot for liquid water to exist but also too cold for the seas of lead. This area was originally lifeless, however, life from D'Naevium, a similar environment, seized the opportunity to live in this otherwise barren region. Artificial life and self-replicating machines also call the region home, their creators having little motivation to purge the area of them. Since life has began abounding here, the Ror Units and Vlanoans call the region home.

The largest region by area is the outermost region, the only area capable of sustaining liquid water. This area is divided into two parts, the "summer" and "winter" zones. Large seas cover much of this area, sustaining a flourishing ecosystem of mostly carbon-based life. Holding the bulk of the population, industrial capacity, and economic production, this area has historically been the most powerful force in the disk's history.

Seasonal Climate

Since the disk is far more massive than the star itself Eos bobs up and down in the center of the disk and the disk itself wobbles. The wobbling creates freeze-thaw cycles in winter areas as the experience longer or shorter "days." Eos bobs up and down in the center of the disk, orbiting a barycenter between it and the disk. Consequentially, this bobbing is more like an orbit, causing it to becoming closer to some areas and farther from others throughout the "day." Eos takes three days to orbit the barycenter, creating a day-night cycle.

Orbiting Bodies

Numerous bodies orbit Eos, many of which are fragments of the object that were broken off of it in its long history. One such planet, Hikari, was a large mass of Eos that had enough mass to collapse into a sphere. Another orbiting body is Albedo, a world that reflects so much of starlight that it ranks among some of the brightest objects in Eos' night sky. The second brightest object in Eos' night sky is Eosphoros, a Hedonist World locked in a perpetual stasis over the so-called Dark Side of Eos.

Dark Side of Eos

Reverse the highly populated side of the disk is a sparsely populated region poetically called the "dark side." At different points in history, it was just as habitable as the "light side," however, radiation from the neutron star Demiurge makes it uninhabitable in the present. With only a population of one trillion calling this side home, the opposite side is, both politically and economically, the mirror image of the main side. Nations on Eos simply control the territory they possess all the way through the structure.

Composition

Outside of the rings and the filaments connecting them and supporting the ground, Eos is composed of whichever substance was cheapest for the civilization building the section. Some areas are composed of lithium and beryllium, suggesting a civilization capable of large-scale fusion without much use for these materials. Many areas are composed of heavier metals; asteroids were commonly turned into a liquid and used as material for 3D printers. Silicates are common as well. There is evidence that entire planets have been used as feed-stock for some of the oldest areas.

The most recently-built areas, built by the Dominion of Astraeus, are composed mostly of an iron-slilicate mixture. It was created by importing energy from Sagittarium to turn an orbiting planet, Aura, into raw materials for the expansion of the disk. While most of the disk is solid, filled with an ultra-low-density substance that maintains rigidity despite being mostly vacuum, many of the newer areas have yet to have been filled in, creating a slightly diagonal pull of gravity in those regions.

Phaethon

Phaethon is a large decentralized network of Pylons, quantum computers, servers, and machines which maintains the structure of Eos. It powers the orbital rings, is likely responsible for the creation of the micro-black-holes within, and gathers the energy needed to continually power Eos' active support system. The star itself does not provide nearly enough power for this end, necessitating this system.

Phaethon primarily gathers its power from the star Gira Gira, with over sixty percent of the system's components located in that system. It remotely supplies power to Eos via a clever use of the Thaumic Drive. By remotely activating a Thaumic Drive, it can cause the outermost orbital ring to spin. Unlike the other rings, the outermost ring generates electricity as it spins rather than consumes it, meaning it needs to be actively spun to maintain its orbit. Phaethon supplies this spin using the ample energy of Gira Gira.