Miramac

Miramac is a terrestrial planet and homeworld of the Sheelki species. It is the most populous planet in the galaxy and the political hub of the Mirdiannyus.

Physical Composition
Miramac is a massive terrestrial planet whose diameter is comparable to that of a gas giant. Its size and relatively low mass are due to the composition of its crust and mantle: the majority of the planet's volume is comprised of highly porous sandstone, believed to have been formed when subterranean vents deposited large amounts of hot air into the planet's cooling surface. As such, in spite of Miramac's incredible surface area, it has gravity comparable to most inhabitable terrestrial worlds. Covering this rock is a thin layer of sand or soil, home to the planet's shallow-rooted vegetation. The porosity of Miramac's surface limits the amount of weight that can be placed upon it; Miramaiyan buildings are designed in a manner that distributes their minimal weight over a large surface area.

Biomes
Miramac's biomes are limited due to the planet's thin soil and single kind of rock. Its two continents can be each be considered a distinct biome, though there are still many similarities. Ouaios, Miramac's larger continent, is a colossal mesa with limited vegetation such as shrubs and grasses; aquifers and groundwater are limited due to the large coastal mats of seaweed restricting the flow of water into the landform's rock. Xeuk, the smaller continent, is a long chain of islands whose rocks are highly saturated with water, allowing for lush greenery such as ferns. Trees or similar flora do not exist on Miramac as they would be too heavy to be supported by its surface.