Solias

Solias is a fictional terrestrial planet in the science fiction universe known as the Lumen Archive. It is commonly depicted as an Earth-like world with temperate climates and extensive ocean coverage, located in the Sol system.

Astronomical and physical characteristics place Solias at roughly Earth-like size, with a radius near 1.02 Earth radii, a mass about 1.05 Earth masses, and a surface gravity around 1.0 g. It orbits a G-type star and completes an orbit in approximately one Earth year, with a relatively mild axial tilt that yields seasonal variation.

Geographically, Solias features two major landmasses, Valora and Caelum, separated by a wide continental shelf and a broad central equatorial region of rainforest and coastal ecosystems. The planet's atmosphere is modeled as a nitrogen–oxygen mix similar to Earth's, with a surface pressure near 1 atmosphere, supporting diverse terrestrial life.

In the lore of the setting, Solias hosts varied biomes, from temperate forests to tropical coasts, and is known for shallow seas that harbor coral-like microbial ecosystems. Historically, Solias is depicted as having been surveyed by interstellar expeditions in the mid-22nd century, followed by colonization and the development of mixed human and alien settlements.

The planet figures prominently in several works within the Lumen Archive, where it is used to explore themes of ecological balance, technology, and cultural exchange.