100th Millennium Wiki
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Overview

The Nyrin Galaxy is a small, low metallicity spiral galaxy, and is the smallest spiral galaxy in the universe. Being the closest satellite of the Flower Galaxy, the Nyrin Galaxy has recently been under a lot of tidal forces, which has deformed it to the point that one of its two distinct arms has been nearly erased into the galaxy. As a result, star formation is rampant throughout the galaxy.

Being a relatively low metallicity galaxy has kept Nyrin from developing many civilisations in the past, and any civilisations that arose would be able to take control of the entire galaxy without many obstacles. However, a recent surge of star formation (not enough to quickly exhaust the galaxy's gas supply though) has seeded the galaxy with many heavy elements, which has allowed a lot of lifeforms to develop.

Galactic structure

The Nyrin Galaxy has two spiral arms, known as the Kael Arm and the Aghori Arm. The Kael Arm is distinctively smaller than the Aghori Arm. Along with the Core, most of the mass in the galaxy is concentrated in these 3 areas. However, a significant amount of mass can also be found in the Hinterlands, far away from the spiral arms. Here too, star formation is happening, and many new civilisations are popping up.

The Nyrin Galaxy contains 613 million stars, relatively little for a galaxy of its size. At the centre of the galaxy there is a supermassive black hole, known as Eyerin, with a mass of 2.51 million solar masses.

Core

The Core contains some of the oldest stars in Nyrin, and is the oldest part of the galaxy. The large amount of cool, dying stars gives the Core a yellowish tinge. However, recently, an extreme burst of star formation happened in the centre of the Core, near Eyerin, which has resulted in many massive clusters, brightening the Core overall and whitening it.

Kael Arm

The smaller of the two arms, the Kael Arm has severely shrunk since Nyrin entered a close orbit around the Flower Galaxy. As a result, star formation rates are unsustainable and the highest in any region of the galaxy, but for some reason, there are not many large nebulae visible from outside. The Kael Arm is quite inhospitable due to the sheer amount of star formation.

Aghori Arm

The larger of the two arms, the Aghori Arm has a stable, albeit high rate of star formation. Many large nebulae are visible from outside, especially in the inner part of the arm. Life is more common here than in most of the galaxy, with rates comparable to those found in other galaxies. As the People's Union of Kuruva's power has waned, many nascent civilisations are arising, but there is limited space.

A map of the Nyrin Galaxy

Hinterlands

The outer reaches of the galaxy. The Hinterlands are the result of an older wave of star formation, and there are many evolved massive stars in the region, giving it a distinct blue sheen. This region is actually quite quaint, as star formation is slowing down to a more sustainable level. A few civilisations are developing in these far off regions.

History

Formation Era (13.462 - 12 Gyr BCE)

The Nyrin Galaxy forms, in a far-off corner of the universe. At the time, star formation rates were extremely high, unrecognisable from today, and the metallicity of the universe was so low that life as we know it couldn't possibly exist. At that time, it was an amorphous blob of gas and stars, and it wouldn't be until after the end of the era that the galaxy's characteristic spiral arms appear. Nyrin's central black hole, Eyerin, was an extremely luminous quasar, and started to stop star formation by heating up previously cold gas, which would make it impossible to form stars. The many incredibly luminous stars in the galaxy had the same effect on star formation.

Reformation Era (12 - 10.1 Gyr BCE)

The Galaxy takes shape, and several arms begin to form. Star formation slows down rapidly due to Eyerin, grinding to a near complete halt, and over time, the spiral arms merge into two opposite arms.

Quiet Era (10.1 - 2.81 Gyr BCE)

Not much happens during this era. Star formation slowly dies out, and by the 8 Gyr BCE mark, its effects on the galaxy become negligible. The galaxy takes on a deep yellow hue, filled with dying stars and stellar remnants. Sometimes there is the occasional civilisation here and there, but there are so little opportunities for life to arise that any effects of civilisations on the galaxy are barely noticeable. The galaxy slowly dims, as it wanders around the universe, barely noticeable against the background radiation of the Universe.

PUK Era (2.81 - 0.78 Gyr BCE)

This is when the People's Union of Kuruva, a "socialist democracy" started to spread across the Nyrin Galaxy. At its time, there were no other civilisations in the galaxy, and the PUK expanded across the galaxy with relative ease, despite being slow compared to other civilisations. By the 2 Gyr BCE mark, the PUK controlled all of the inner Aghori Arm (where it originated), most of the outer Aghori Arm, all of the Core, most of the Kael Arm and most of the Outer Core. Over time, it got more and more control of its citizens, to the point where they were literally being mind controlled by the PUK, which ruled nearly all of the Nyrin Galaxy with unparalleled stability and without interference.

However, slowly, as the Nyrin Galaxy approached the Flower subcluster, star formation restarted, initially very slowly. However, it was soon clear that the galaxy would enter a close orbit around the Flower Galaxy. The PUK didn't think that many consequences would arise from this. However, they were far from the truth. As star formation ramped up, the higher metallicity environment slowly allowed for more life to exist, and the many explosions produced by dying massive stars disrupted the PUK's relatively weak infrastructure.

Revitalisation Era (780 - 558 Myr BCE)

As the Nyrin Galaxy approached the Flower Galaxy, tidal forces exerted by the Flower Galaxy along with its large satellites reignited star formation. For the first time in 10 billion years, bright blue massive stars came into being again, lighting up the almost invisible galaxy up from inside. As the metallicity in the galaxy's environment started to increase for the first time, opportunities for life to get started became more and more common as Nyrin approached the Flower Galaxy. Along with this, the deaths of the massive stars posed problems for the PUK's weak infrastructure, as the PUK never had to deal with the problem of supernovae, and as a result, some of the PUK infrastructure was heavily damaged by supernovae, especially in the two arms.

Instability Era (558-393 Myr BCE)

458 million years ago, a particularly bright supernova caused by a dying Wolf-Rayet star damaged a peacekeeper (a megastructure used by the PUK to keep its citizens in control) nearby, causing several trillion PUK subjects' minds to be freed. They found themselves in a world of oppression, and didn't think that it was a good idea. However, the PUK immediately got notified of this and sent several armies to kill them before things got out of hand. Although the vast majority of them got massacred, a few dozen subjects escaped the planet they were on. When they reached space, they saw the carnage that had happened, and realised the huge opportunities that arose to free all the beings from the PUK. This would be the beginnings of the Northern Revolution and eventually the Republic of Kembar.

As star formation became ever more common, many events like this happened, especially in the vicinity of the first event. As it started to lose more and more control of its citizens, the PUK did not know how to respond to this. Some people wanted to reinforce the PUK's feeble defences, but others feared this would put a total end to control of the PUK's subjects, and in the end, nothing happened. As a result, the PUK lost control of most of the Kael Arm, and nearly all of the Northern Hinterlands.

First Civilisation Era (393-129 Myr BCE)

393 million years ago, the first of many new civilisations resulting from the increased opportunities for life sprung up, in the Southern Hinterlands. It found itself alone, except for the PUK, but it was too busy trying to ward off the consequences of star formation rates it was never meant to handle. Over the next hundred million years, several other civilisations would spring up in various parts of the galaxy, a couple even in the PUK's territory, which made it even less stable. It was clear that the PUK's days were numbered, but it still had some time left.

Kael Arm Exodus

About 129 million years ago, millions of years of extreme star formation in the Kael Arm led to what is now known as the Kael Arm Exodus, in which about 70,000 massive stars exploded in a span of 240,000 years, destroying a lot of PUK infrastructure in the area and practically wiping out its presence in the arm. The event also indirectly freed the minds of quadrillions of individuals by destroying many peacekeepers across the arm. This left many stellar remnants in the arm, as well as very many X-ray binaries, bathing the arm in radiation and making it harder to recolonise, which the PUK tried, but it was only able to recapture a bit of the arm.

Second Civilisation Era (129-35 Myr BCE)

Even more civilisations arised during this period, big and small. Nyrin's political scene became quite similar to that of many other galaxies. None of the civilisations which existed during that time (except the PUK) are still around today, and towards the end of this period, many conflicts had broken out between the different nations. Many perished, and damage of celestial proportions is still visible today.

Nyrin Wipeout

As the PUK became more involved in the conflicts, it decided to try to stop all the wars by demolishing all the states involved, in an event known as the Nyrin Wipeout, which occurred approximately 35.2 million years ago. Not very much is known, but what has been disclosed by PUK officials or PUK defectors, along with external observations indicates the use of things such as artificial gamma-ray bursts, artificial supernovae (both type I and II), and other stellar-related weapons of mass destruction.

Timeline

Key

Anything in bold is considered to be a major event.

BCE - Before Common Era

CE - Common Era

Before Common Era

13,550,000,000 BCE: - Eyerin forms, in a distant part of the very young universe.
13,462,000,000 BCE: - The Nyrin Galaxy forms.
13,390,000,000 BCE: - Eyerin becomes an AGN and quasar, stifling star formation in the galaxy.
12,200,000,000 BCE: - Eyerin calms down.
12,150,000,000 BCE: - Nyrin's spiral arms start to appear.
11,880,000,000 BCE: - The Kuruva Cluster forms.
10,500,000,000 BCE: - There are no more H II regions larger than 100 light years in diameter.
9,200,000,000 BCE: - Kembior forms in the Kuruva Cluster.

- The last O-type star in the primordial Nyrin dies.

8,000,000,000 BCE: - The effects of star formation on the galaxy becomes negligible.
7,000,000,000 BCE: - The Kuruva Cluster is the only place in the galaxy capable of forming stars.

- A civilisation exists in the Northern Hinterlands for about 1,500 years.

6,400,000,000 BCE: - The population of B-type stars falls to 0 for the first time.
5,490,000,000 BCE: - Life arises on Ripal.
2,810,670,000 BCE: - Intelligent life arises on Ripal.
2,810,031,000 BCE: - Society is founded on Ripal, which achieves space travel soon after.
2,810,000,000 BCE: - The People's Union of Kuruva is founded after a large proletariat revolution.
2,776,000,000 BCE: - The PUK controls the entire Kuruva Cluster.
2,751,400,000 BCE: - The PUK discovers FTL travel and communication.

- The first peacekeeper is constructed, around a red giant star in the Kuruva Cluster, which was stabilised.

2,458,000,000 BCE: - The PUK reaches Eyerin.
2,380,000,000 BCE: - The PUK controls the entire inner Aghori Arm.
1,800,000,000 BCE: - Nyrin starts to drift towards the Flower Subcluster.
1,040,000,000 BCE: - An O-type star forms, for the first time in 8 billion years.
920,000,000 BCE: - Nyrin becomes the closest galaxy to Flower for some time.

Notable Celestial bodies and systems

  • Kuruva Cluster - A giant open cluster, containing aging, low-mass stars as well as young, bright high-mass stars. The Kuruva Cluster was the only surviving open cluster after the end of star formation in the Nyrin Galaxy, about 12 billion years ago. It is the origin of the People's Union of Kuruva, currently the most powerful nation in the galaxy, but that may soon change.
  • Ripal - The capital of the PUK, Ripal is a very habitable world, with seas and continents. There are many large cities on the planet, which can clearly be seen in the night. The planet is mostly reserved for powerful, free individuals within the PUK government, and the population isn't too high that nearly 2 billions of occupation has made it inhospitable. Ripal is located in the centre of the Kuruva Cluster.
  • Kembar - Although Kembar is similar to Ripal, it originally started with no life, but thanks to unknown geological processes, Kembar had and still has a breathable atmosphere. The planet is the capital of the Republic of Kembar, a truly socialist democratic state and one of the largest nations in the Nyrin Galaxy.
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