Astål

Astål is a fictional planet located in the fictional galaxy of Xylos. It is described as a tidally locked world, meaning one side perpetually faces its star, Solara, while the other remains in eternal darkness. The habitable zone, where liquid water can exist, is a narrow band between these two extremes known as the twilight region.

The atmosphere of Astål is rich in nitrogen and oxygen, with trace amounts of methane. This composition supports a unique biosphere adapted to the constant dim light of the twilight region. Plant life on Astål is characterized by its dark pigmentation, allowing it to absorb the maximum amount of available light. Fauna tends to have enhanced senses of hearing and smell to navigate the perpetual twilight.

The dominant intelligent species on Astål are the Lumina. They are a sentient race with bioluminescent qualities, allowing them to communicate and navigate through subtle changes in their internal light. The Lumina have developed a sophisticated civilization focused on understanding and harnessing the energy differentials between the star-facing and dark sides of their planet. Their technology often involves advanced thermal regulation and light manipulation.

Astål's geological features include vast, crystalline deserts on the star-facing side, constantly bombarded by solar radiation, and frigid, ice-covered plains on the dark side. The twilight region is characterized by dense, phosphorescent forests and subterranean cave systems where many Lumina settlements are located. The planet's axial tilt is minimal, leading to no distinct seasons.