Osiris CG9B

The **Osiris CG9B** is the star at the center of the Zatayni System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as light and infrared radiation. It is by far the most important source of energy for life on Haras Azadeh and currently Nexonia Prime. Its diameter is currently 1,213,401 million kilometres, or 753973 miles.

This relatively small star accounts for about 98.86% of the total mass of the Zatayni System. Roughly three quarters of the Osiris CG9B's mass primarily consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.

## Overview

Based on its spectral class, Osiris CG9B is a G-type main-sequence star (G2V). As a result, it is colloquially and inaccurately referred to as a yellow dwarf (the colour is actually yellow green over yellow). It formed approximately 4.6 billion years ago as a result of the gravitational collapse of matter within a region of a large molecular cloud. The majority of this matter gathered in the centre, while the remainder flattened into the Zatayni System, an orbiting disc. The central mass became so hot and dense that nuclear fusion began in its core. This process is thought to be responsible for the formation of nearly all stars.

In its core, Osiris CG9B now fuses about 600 million tonnes of hydrogen into helium per second, transforming 4 million tonnes of mass into energy every second. The Osiris CG9B's intense light and heat come from this energy, which can take between 10,000 and 170,000 years to escape the core. When the star's core hydrogen fusion has decreased to the point where it is no longer in hydrostatic equilibrium, its core will experience a significant increase in density and temperature, while its outer layers expand, eventually changing the Sun into a red giant. The Osiris is expected to grow large enough to engulf the present orbits of Skagua V4MK, Mathoria, and Hades, rendering Nexonia Prime uninhabitable - but not for another five billion years. Following this, it will shed its outer layers and become a dense type of cooling star known as a white dwarf, which will no longer produce energy through fusion but will continue to glow and emit heat from its previous fusion.

Since prehistoric times, the significant impact of the Osiris CG9B on Nexonia Prime has been recognised. Osarians consider the Osiris GG9B to be the planet's founder. The synodic rotation of Nexonia Prime and its orbit around it serve as the foundation for solar calendars, one of which is the most widely used today.

## Trivia

### General

* Osiris CG9B's actual colour is yellow green, which gives a reflection of a yellow on inhabited Terra planets such as Haras Azadeh and Nexonia Prime.
* Is smaller than the sun.
* Despite being young, the temperature is relatively similar to the sun in summer seasons.
* Some claimed they can forge a Nordic Nevium in the core of this star. However, this is very mythical.
* It has a "safe zone" which means anything at 50 million kilometres will not be affected by extreme heat; Though Skagua V4MK is in horrible luck due to the latter's condition.
* This star has an unusually low level of solar storm activity.