The Imperium of Man

The Imperium of Man controls nine major planets as well as a host of smaller, less populated planets.

Akeir Akeir is the Imperial home world and thus is the permanent residence of the Empress. It is also the homeworld for House Cormac and the Church. Aekir is temperate and mild and is best known for its vast mega city of the same name.
Atira Known for its beautiful mountains and fjords, Atira is a cold planet, but not unpleasant. It is the homeworld of House Kree, the foremost scholars in the Empire.
Jord Jord is home to House Juntach's renowned swordsmen. It is primarily an arid planet, but does have many lush river valleys as well.
Kala Kala is a cold and uninviting planet, though starkly beautiful. House Fi'grim make the home here, finding their warrior nature at home in its frigid severity.
Ottar House Vinro's homeworld is mild and temperate. Their massive city is only matched by the great city of Akeir.
Spentha Temperate and mild, Spentha is the homeworld of House Weilok. Spentha is the origin of the most innovative of cybernetic and technological developments.
Taiowa The homeworld of House Huron is primarily made up of water. It is commonly called the Island Planet for its many small and beautiful isles.
Tokpa Known for its vast dark forests and jungles, Tokpa is home to House Svarog.
Tokpela House Eioph, reknowned surgeons of the Empire, make their home in the underground cities of Tokpela. Its surface is dry and so unforgiving as to have driven all residents to dwell beneath its surface.