Eytinore's star is a star in the Ouranir Galaxy and was discovered in 4767 by astronomer Johan Eytinore. He noted it as an intense BY Draconis variable with a strange abundance of elements not seen normally in a star. Sadly, like so many other stars, it was pushed to the side. But it came back in the limelight when in 9952 CE, it was visited by the WDS Isvoy, along with one of its planets, Ovod. It was noted for having a planet that hosted evidence of a now-extinct civilisation.
Jaygam: Jaygam is the first planet from Eytinore’s star. It is a hot ice giant that orbits the star every 9 days. As a result of its proximity, it constantly loses mass from Eytinore’s star’s stellar wind. It was once a scorched gas giant, but after the superflare event, it lost a lot of mass and became the neptune-sized world we see today. It has one dwarf moon.
Estroya: Slightly further out from the star, Estroya is Eytinore’s star’s second planet. It is very similar to Jaygam, except it is cooler and smaller. It has 8 dwarf moons.
Yzkru: Yzkru is the third planet from Eytinore’s star. It is small, light, relatively dense and covered in craters, and it has no atmosphere. It is very rich in resources like platinum, gold, tungsten, rhodium, neodymium and other similar materials. Yzkru has 5 moons, all of which are dwarf ones.
Belzhaien: The largest planet in the system, Belzhaien is a sizeable gas giant with nearly 175 standard terrestrial masses. It is very blue, indicating the presence of methane. It has 20 dwarf moons.
Ovod: Ovod is by far the most important and mysterious of the 6 planets that encircle Eytinore’s star, and initially for very good reason, because it seems to be very habitable. However, it is much more interesting and dangerous than it first appears. It was once the homeworld of a vast civilisation that extended to more than 100 lightyears in every direction out. But due to several serious events, Ovod would become inhospitable and civilisation would become extinct. Relics of this dead civilisation can be found all over Ovod, and scattered through the system. Ovod has one large moon, Kanhos, and four smaller dwarf moons.
Nabmyk: Nabmyk is a large desert world and is the last planet orbiting Eytinore’s star. It once held a thicker atmosphere than the one it has now.
Throughout the millenia, more and more was revealed about this most perplexing star, including its age. That surprised scientists most, because while Eytinore's star behaved like a 20-million-year old star, it was in reality nearly 6.7 billion years old. This was completely unexpected, and so the star remained an anomaly until the entire story that played out on one of its 6 planets was finally unravelled: there had once been a civilisation, which suddenly wiped itself out around a million years ago.
Explanations for anomalies
This explained the strange elements anomaly, which was in fact a sadly destroyed Dyson sphere that malfunctioned and plunged into the star, making it more active than it should be. This was due to a dying civilisation trying to have a last bit of fun before its entire extinction. It was dying due to a previous war that had left their entire homeworld (Ovod) radioactive, and cancer-esque diseases were rampant.
As a result of wanting to keep an enjoyable life, the civilisation planned to build a Dyson sphere which would power a device and immerse every being in a virtual universe. However, due to the radioactive equipment used (because Ovod was now radioactive), a neutron fired from a radioactive piece of equipment flew into a chamber full of radioactive materials somewhere in space orbiting the star. It caused a chain reaction, blowing up the entire chamber as if a nuclear bomb. (The reason for these chambers being up there is still unclear to this day)
The now-broken Dyson sphere plunged into the star at high velocities. As the material fell in, it sped up reactions inside the star, making it behave as if it were completely new. Flares became extremely commonplace, and flare after flare, life became rarer and rarer on Ovod. It all came to a close when a few decades after the incident, a massive solar flare from the star fried Ovod, as it became 1500 times brighter than it usually is. This destroyed a large part of the outer solar system, leaving only 6 planets behind.
Eytinore's star started out life as a large gas cloud slowly condensing under its own weight. This cloud slowly condensed into a spinning disk, with a large mass at its centre - the prehistoric Eytinore's star.
As the star began to brighten, the disk was clumping together into planets. The ancient Belzhaien was quickly gaining mass a few astronomical units distant, while many small rocks were moving around in the inner solar system. The prehistoric Jaygam and Estroya were forming around 8 and 13 astronomical units out, however due to Belzhaien's migration into the inner system, they followed, flinging multiple planetesimals and fledgeling planets into longer orbits, and among them was the developing Ovod. At the time about the size of the moon, Ovod was quickly gaining mass and becoming more and more habitable. 1 million years after the star's formation, many planetesimals were gone and the large planets had pretty much settled into their orbits, although Nabmyk's orbit was still slightly inclined.
Around 30 million years after the star's formation, the protoplanetary disk evaporated, and the planets were finally free to settle into their stable orbits. They did so, and after a few planetary interactions, it seemed that the system was finally stable.
That would change 2 billion years later, when an unknown hypervelocity star was careening through the Ouranir Galaxy, and encountered Eytinore's star. It was about 0.4 solar masses and had come as close to Eytinore's star as 185 AU, destabilising many of the outer orbits. The planets' orbits became either extremely eccentric or entirely hyperbolic, leaving the star system. The remaining worlds on eccentric orbits would either be thrown into the star by the stable planets or ejected.
Now, only 6 planets remained in orbit, and everything was fine for a while.
Although Eytinore's star's behaviour is set back, its evolutionary status is not, and has not changed from the Dyson sphere incident. As a result, in around 8 billion years' time, Eytinore's star will leave the main sequence, becoming a subgiant star. Helium burning will start in around 10 billion years' time, which means that the star will rapidly swell into a red giant, engulfing Jaygam and Estroya, and possibly Yzkru.
It will slowly shrink over the next billion years, becoming an R Corona Borealis variable and pulsating, losing a few percent of a solar mass in the meantime. Finally, it will make one last ditch attempt at staying alive and balloon into an asymptotic giant branch star (AGB) and swallow all 6 planets it currently has. It will lose a lot of mass as it starts to pulsate as a Mira variable, possibly becoming a carbon star or a zirconium star. Finally, 13 billion years in the future, it will finally shed its outer layers and die, becoming a slowly shrinking, very hot object. This object will one day evolve into a white dwarf and cool off for the rest of time, until 10^33 years into the future, when it dies too as all its protons disintegrate into radiation.