Mathelos

Mathelos is a fictional planet located in the Andromeda Galaxy. It is known for its unique geological formations and a singular, massive ocean that covers most of its surface. The planet's atmosphere is rich in nitrogen and oxygen, with trace amounts of argon. Its star, a yellow dwarf similar to Sol, provides ample light and warmth, supporting a diverse ecosystem.

The dominant life forms on Mathelos are aquatic. These organisms range from microscopic plankton to colossal, bioluminescent creatures that inhabit the ocean's depths. The planet also hosts a limited number of land-based flora, primarily hardy, salt-tolerant plants that cling to the scattered archipelagos.

Mathelos has no indigenous sentient species. However, it has been visited by several interstellar civilizations for scientific research and resource exploration. Its oceans are a subject of intense study due to their unusual chemical composition and the biological adaptations of the creatures within. The planet's gravity is slightly lower than Earth's, and its day-night cycle is approximately 30 Earth hours long. No permanent settlements have been established on Mathelos, though temporary research outposts have been deployed on its larger islands.