Slyaris

Slyaris is a fictional planet featured in the science fiction novel "The Last Starship" by author Alex Vance. The planet is depicted as a tidally locked world, meaning one side perpetually faces its star, Solara, while the other remains in eternal darkness. This unique celestial arrangement results in extreme environmental conditions. The sun-facing side, known as the "Sunlands," is a scorched, arid desert with intense radiation, making it largely uninhabitable for most known life forms. Conversely, the dark side, or "Shadowlands," is locked in a perpetual, frigid twilight, characterized by vast ice sheets and sub-zero temperatures.

Life on Slyaris is said to exist primarily in the "Twilight Zone," a narrow band between the Sunlands and Shadowlands where temperatures are more moderate. This region is characterized by strange flora that has adapted to fluctuating light levels and limited resources. The native inhabitants, referred to as the Slyari, are a resilient species believed to have evolved to withstand the planet's harsh conditions, possibly possessing unique physiological adaptations for survival. Their society is often portrayed as being deeply intertwined with the planet's extreme dichotomy, with their culture and technology reflecting their struggle for existence. The novel explores the challenges and discoveries made by a human crew arriving on Slyaris, encountering both its dangers and its secrets.