Sibli

The planet
Sibli is the sixth planet of the Isträ system. It was named by Emeth Jacostia after his sister.

Size and structure
Sibli is not a habitable planet, even though it appears to be the only planet apart from Themeris that could bear life. The air is mostly composed of carbon dioxyde and helium but also shows noticeable amounts of oxygen. The atmosphere is thick enough to actively protect the planet, but Ether studies have reported that the planet has gone through an intense volcanic activity peak which has covered the sky with an ash roof similar to the one found in Heas, making the planet very cold. It was noticed that the air was vraisemblably mainly made of Azote, but the insanely low temperatures have made the gas liquid, creating oceans of liquid azote. Several glaciers have been spotted near the poles as well as in the bed of what appears to be the remnants of rivers and oceans, meaning the planet may have once seen life developing before its sudden volcanic activity peak.

Advanced studies have shown that the planet's core is not made of Arcane crystals such as the one on Themeris but was made of conventional magma.

Moons and rings
2 moons are orbiting around Sibli and 5 rings are surrounding it.

The moons :

 * Esia is the first and biggest moon of Sibli. It was named after the daughter of Emeth Jacostia's sister.


 * Pauro is the second and smallest moon orbiting around the planet. It was named after the son of Emeth Jacostia's sister.

The rings :
5 rings total are surrounding the planet. Two of them are large identically wide rings made of dust and rock while the three external rings are made of wider orbiting asteroids that vraisemblably come from a bigger asteroid that once collided with the planet, as they all have the same composition and all have the same important amount of copper and iron in them.

Climate
It was theorized that, despite always being cold, the planet had once been under very acceptable climatic conditions, but a sudden peak of volcanic activity has supposedly created a thick ash roof that blocked sunlight and slowly turned it into a freezing planet. Its extreme temperatures are barely tolerable, even for adapted probes.

Resources and commercial interest
Ether studies have shown that the planet is filled with an important amount of silver, nickel and palladium. Despite its very low temperatures, the planet exploration corps has tried to come up with automated mining probes that could work under the extremely low temperatures of the planet, which worked, but the expensive nature of the probes and the amount of time needed to build a single one made the results less satisfying than expected. Eventually, the idea of mining Sibli for resources was dropped when the space spheres were discovered.