Arean worlds can be considered a "mature" terrestrial planet; that is, it has essentially ceased evolving and has remained unchanged for much of its history. These worlds are marked by little to no geological activity, as well as tenuous atmospheres. These worlds tend to be of lower mass, which is by and far the main reason for their characteristics.
However, not all Arean worlds are low mass. But even larger planets lack a geological cycle. Some may simply have a massive crust, while others may be deficient in heavy metals. Whatever the case, the planets are frozen wastelands with eroded atmospheres.
Life can exist on these planets, but for the most part they are microbial extremophiles, often existing deep underground where the sheer rock pressure maintains a higher temperature than the surface. Other forms may live within ices, or even in subsurface thermal areas. Sometimes, if the planet in its youth maintained habitable conditions for a significant amount of time, there may be macro-sized fossil evidence. Regardless, from the surface Arean planets appear quite dead, both geologically and biologically.
Mars, the archetypal Arean world.
The sandy surfaces of Arean worlds are lifeless, but they hold many indications of their geological history.
Areans of Note: Mars is the first form of Arean world that Humans ever encountered, but for much of history this world was a mystery. Even today we learn new things about the Red Planet that increase our understanding of planets in general.
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