Therra

Therra is a fictional terrestrial planet in the Therra system. It orbits a mid-sized K-type star and completes a year every 236 Earth days. The planet is the third from its star and features a temperate climate with seasonal variation.

Therra covers about 70 percent of its surface with ocean, while the remaining landmasses form scattered archipelagos in the southern hemisphere. Its terrain includes temperate forests, volcanic highlands, desert basins, and expansive wetlands. The atmosphere is nitrogen-oxygen, producing a breathable air at sea level.

The Therran biosphere includes adapted flora and fauna. Notable endemics are glowcap mosses in coastal belts, the rookwood trees stabilizing river courses, and several large herbivores in forested regions. Marine life dominates the coastal zones, with diverse coral and fish communities.

Historically, Therra was first surveyed by interstellar expeditions in the late 22nd century within the setting's fiction. It became a hub for colonization and scientific research. Political organization ranges from a planetary council to regional authorities in alliance with a wider interstellar framework.

In fiction, Therra is depicted across novels and interactive media as a world of scientific discovery, resource management, and political negotiation. Its portrayal varies from pristine environments to contested frontier regions, reflecting common genre themes of exploration and stewardship.