Birran

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Birran, one of the brightest stars in Carlea's night sky

Birran is a white supergiant star in Florathel, around 450 light years from Carlea. Birran's luminosity makes it one of the brightest stars in Cosmoria, and it was the site of a key battle in the War of the Last Alliance that marked the turning point of the entire war.

## Properties

Birran is a very large star, with a radius of over 130 standard stellar radii and over 350 times that of neighboring star Maea. Birran is also quite massive, having over 18 Stellar Masses, and being born with around 20.5. It was born as a rare O type star. Unlike O-type stars, Birran is cool compared to them. It has a temperature of around 8600 Kelvins, and is classified as a white supergiant. Birran is very much evolved, far from the main sequence and well into its giant phase. It is in fact going through a blue loop and will become a red supergiant again in around 220,000 years.

## Surroundings

Early in the history of Cnara-Frealee, Birran was reached and colonised. Some of its original planets were disassembled to create an important dyson sphere, which would allow them to tap into almost 700 times the energy available to the next brightest star in their territory, Raea. Progress on this dyson sphere was slow at first, but soon it it became very quick as exponential starlifting came into effect and after a few decades the main part of the dyson sphere was completed. Then, an idea started to sweep the public of the Cnara-Frealee Federation - building a Matrioshka brain which could power many computer simulations and create a virtually identical online copy of the real universe. It was an exciting prospect.

In 55881 CE, construction started on what would become the first Matrioshka brain made by the Cnara-Frealee. The excitement for this was so high that after only 14 years, it was finished. Soon, many billions of minds were uploaded in the virtual reality. This was a testament to the growing federation's potential.

## History

### Formative Years

Birran formed a mere 17.6 million years ago inside the Enralka nebula, a small H II region and the closest of such to Carlea. It formed much like any other star, beginning as a very large Bok Globule and condensing to form the Birranian protostar 17 million years ago. It was a dull red, giant ball of gas which was still compressing, and then, 2 million years later, sparked into life as searing hot blue star.

Soon after its formation, Birran's system started producing planets. Birran's harsh stellar wind was fortunately not strong enough to prevent this, and 3 planets were formed. They have since been disassembled to make the matrioshka brain.

Around 3 million years ago, Birran started to evolve off the main sequence. It started to expand and cool, but also brighten and lose mass. This was because the star had exhausted most of the hydrogen in its core, and its core contracted and heated up, forcing the outer layers to expand. It became a blue-white supergiant and then a small red supergiant. Birran stayed this way for a while, but then around 300,000 years ago, it experienced a blue loop and the entire star briefly experienced fusion. Birran shrank down into a yellow hypergiant and then almost immediately to a white supergiant, and this is where it is today. Soon, Birran will become a red supergiant again.