Threus

Threus is the homeworld of the Vannah. It is a desert planet orbiting the star Yesun in the Triangulum Galaxy.
==Characteristics==
Threus orbits 0.85AUs from Yesun, a G6V-class star.
===Size===
Threus has a diameter of 13,500 km and a mass of 0.9 Earths. It has a density of just over three-quarters of Earth's and a surface gravity of 0.8g.
===Dynamics===
The planet takes 19.9 hours to rotate. Its axial tilt is 12.3 degrees, and is stabilised by its moon. It takes 301 Earth days to revolve around its star.
===Composition===
The crust of Threus is 44.5% oxygen, 28.1% silicon, 7.4% aluminium, 5.2% iron, 3.9% calcium, and the remainder other elements.
===Surface===
Threus' surface is 45% water. Most of the remainder is desert and savannah, with no ice caps. The average global temperature is 23 degrees centigrade.
===Atmosphere===
The atmosphere of Threus is 79.1% nitrogen, 19.2% oxygen, 1.6% argon, and the remainder other gases.
==Satellites==
Phenomon is a moon of 0.64 lunar masses that orbits Threus at 400,000 km.
==Ecosphere==
Life exists on Threus. The seas are extremely diverse, as are the coastal forests. However, the savannahs are not very biomass-rich.
==Inhabitants==
The Vannahcome from this world. It has a current population of five billion, in very large coastal cities. 
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