Plasmia

Plasmia is a fictional terrestrial planet devised for science fiction settings. In commonly cited portrayals, it is a rocky world located in the outer regions of the Lumen Cluster, orbiting a mid-type star and serving as a laboratory for plasma-related science and frontier mining.

It orbits a K-type star with a semi-major axis around 0.92 astronomical units and a period near 340 days. The planet's radius is approximately 0.97 Earth radii and its mass about 0.85 Earth masses, yielding a surface gravity near 0.9 g.

Its atmosphere is thin, dominated by nitrogen with traces of argon and carbon dioxide. Surface pressure is around 0.8 bar, and oxygen is rare. The climate ranges from arid lowlands to temperate highlands, with pronounced diurnal temperature swings.

Geologically, Plasmia shows extensive basaltic plains, shield volcanoes, and polar ice caps. The planet hosts several active plasma vent areas where ionized gases rise through the crust, creating faint yet persistent blue glows visible from space.

A strong magnetosphere drives frequent auroral displays, particularly near the poles, and contributes to plasma interactions in the upper ambiance.

No confirmed macroscopic life has been observed on the surface. Subsurface microbial signatures have been reported from drilling missions, suggesting a niche biosphere in protected environments.

Research and mining missions target rare minerals tied to plasma chemistry, sometimes referred to in expos as plasites or lumenites. Outposts and orbital stations have studied magnetosphere-plasma coupling and resource extraction.

The name Plasmia derives from its renowned plasma phenomena and thus functions as a focal point in fictional narratives of exploration and technology.