erthen

Erthen is a fictional planet featured in the science fiction series "The Expanse" by James S. A. Corey. It is the third planet in the Sol System, orbiting between Mars and Jupiter. Erthen is known for its vast oceans and extensive ice sheets, which cover approximately 90% of its surface. The planet's climate is characterized by extreme weather conditions, including powerful storms and frequent ice ages. Erthen's atmosphere is primarily composed of nitrogen and oxygen, similar to Earth's, but it also contains significant amounts of methane and ammonia, which contribute to its unique weather patterns.

The planet's most notable feature is its global ocean, which is home to a diverse array of marine life. Erthen's oceans are teeming with bioluminescent organisms and other unique species that have adapted to the planet's harsh environment. The ice sheets on Erthen are also home to various forms of life, including ice worms and other extremophiles that thrive in the cold, dark conditions.

Erthen's surface is mostly covered by ice, with only a few scattered landmasses. These landmasses are often subject to extreme weather conditions, including powerful storms and blizzards. The planet's geology is characterized by its extensive ice sheets and the presence of numerous volcanoes, which are believed to be responsible for the planet's high levels of methane and ammonia in the atmosphere.

Erthen's climate and weather patterns are heavily influenced by its axial tilt and orbital eccentricity, which result in extreme seasonal variations. The planet's ice ages are particularly notable, with periods of intense cold lasting for centuries at a time. These ice ages have had a significant impact on the planet's ecosystems and the evolution of its inhabitants.

Erthen is also home to a number of human settlements, including research stations and mining operations. These settlements are often subject to the planet's harsh weather conditions and must adapt to the challenges posed by its extreme environment. Despite these challenges, Erthen remains an important location in the Sol System, both for scientific research and for its potential resources.