Sirona

Sirona is the name given to the star and system that was eventually settled by humans pre-cataclysm. The name is taken from a Gallic goddess, usually associated with healing springs. The system had been discovered way before the first wormhole station was built, and was given a Alpha-numerical designation. When humanity began to explore the system thanks to the wormhole station, it was given its present name, and the planetary bodies (some detected beforehand) were given temporary names of Sirona I through VI.

The name refers to both the star and the system, the latter usually spoken of as the "Sirona system" or the "Sironian system". The star itself is a K-type, slightly smaller and cooler than the Sun.

= The planets = The system consists of 6 planets, four solid ones and two gas giants.

Sirona I
Sirona I is the closest planet to the star. It's somewhat larger than Mercury.

Dawn
Previously Sirona II, Dawn (Chinese: 黎明 Límíng, Hindi: भोर Bhor, Spanish: Amanecer, Arabic: فجر Fajar) is an earthlike planet in the goldilock zone of the Sirona system. When the planet was first surveyed, it's prominent red colour made many think of a sunrise sky, giving the planet its name. Slightly smaller than Earth, its gravity is at 0.91 G's. Cirka 80% of the surface is covered in ocean, with the remaining landmass being split in two continents. It has two moons, Artemis and Diana.

Pre-Cataclysm
First explored via wormhole in 2071, it was the first exoplanet surveyed that was deemed suitable for surface operations and possible settlement. The following two decades were spent conducting various experiments and scientific research on the planet, including establishing whether the atmosphere could support human life, if the magnetic field of the planet was strong enough to protect the surface, if the fresh water was drinkable, if the local flora and fauna was edible etc. During this period, many scientists died due to various factors, including hostile wildlife and new unknown pathogens; they are remembered as the First fallen.

In 2084, Dawn was deemed suitable and safe enough for future study, and the first permanent scientific base was established on the surface. Special care was taken to not introduce Earthen plants and creatures in case it would replace the local wildlife. In 2089, the first proper settlers arrived, touching down in what is now known as Landfall City. While supplies were plentiful and the surface technically safe for humans, the settlers had to undergo some genetic modification to adapt to their new lives. This modification was mainly to induce natural immunity or resistance to local pathogens, changes to the respiratory system to adapt to the higher atmospheric oxygen content, and changes to the intestines to be able to more easily process food produced from local plantoids and wildlife.

Post-Cataclysm
(Cataclysm is WIP)

As Dawn was cut off from Earth, its population had to find its own way into the future. Many believed that they were the last humans left.

Current situation
The population of Dawn broke 3 million in 2192, the 100-year anniversary of the Cataclysm. With land being plentiful, and the population being small, many settlers spread out across the nearby plains to find their own lands to live off of. There are however three cities of importance that together has about half of the population, with the remaining 50% living in rural communities, mostly inside the "Tri-city triangle" formed by the aformentioned cities.

Newhaven is the largest city on Dawn, and is also considered the political capital, though this has never been made official in any capacity. Newhaven was founded shortly before the Cataclysm, and it quickly grew due to the influx of refugees that arrived from earth. Its population is roughly 900,000.

Serenity is the second largest city with a population of 450,000. The city was founded in the midst of the Cataclysm, as Newhaven quickly overflooded. To relive pressure, a new city was founded down the coast.

Landfall is the third largest city on Dawn and is aptly named: it was here that the first settlers arrived on the planet, and where they established the first community - Landfall is thus the first city on Dawn. Its population is roughly 220,000.

Sirona III
The third planet in the system, Sirona III is about twice as massive as Dawn, but too far outside of the goldilock zone to support any life.

Sirona IV
Sirona IV is a gas giant, mostly red in colour. It sports a single but very prominent planetary ring. It is also the largest planet in the system, slightly larger than Jupiter.

Sirona V
Sirona V is a gas giant, of similar size to Jupiter. The gas clouds give it a mixed colour scheme of various shades of blue and purple.

Sirona VI
Sirona VI is the final planet in the Sirona system, and is about the same size and mass of Dawn.

Sirona VI behaves differently from the other planets. As well as being the furthest planet from the star, its orbit is highly eliptic and eccentric and slanted at an angle. There has also existed liquid water on the surface at one point, as evident by the fact that the planet is completely covered in ice. However, as the average surface temperature has never been observed to go above 60 Kelvin, there is no consensus as to how liquid water could have existed on the surface at all.

The most prominent theory is that Sirona VI was once a rogue planet, picked up by Sirona in passing and integrated into the star system. This explains the irregular orbit, and also implies that Sirona VI may once have been in another star system, much closer to the host star, allowing liquid water to exist on the surface.

= Other noteworthy features =