Threndia

Threndia is a fictional planet within the Andromeda Galaxy, notable for its unique atmospheric composition and the specialized adaptations of its native flora and fauna. The planet's atmosphere is rich in methane and sulfur compounds, giving the sky a perpetual orange-red hue and contributing to a planet-wide temperate climate, though with significant temperature fluctuations between day and night. The dominant life forms on Threndia are silicon-based, a departure from carbon-based life commonly found elsewhere. These organisms, often referred to as "silicates," have developed crystalline structures that allow them to metabolize the abundant atmospheric elements.

The landscape of Threndia is characterized by vast, crystalline plains and towering, geyser-like formations that periodically release superheated gases. Water, as humans understand it, is scarce, with most liquid found in the form of ammonia-methane solutions in subterranean caverns. The native silicates have adapted to this environment by developing complex, slow-moving life cycles and a symbiotic relationship with certain mineral deposits, which they use for energy and structural support. Research into Threndia is primarily conducted by off-world xenobiologists, who are fascinated by its alien ecosystem and the potential for understanding alternative pathways of life development. The planet's unique conditions make it a prime subject for astrobiological studies.