The Yeerk Homeworld is the homeworld of the Yeerks and the Gedds; it revolves around a sun that emits the Kandrona rays which keep the Yeerks alive. The planet is also orbited by a number of moons, only Madra is named. Natural pools are present on the surface, which absorb the Kandrona rays and in which the Yeerks live. The planet has a green sky streaked by constant electrical storms. The native species are the Gedds and the Yeerks. Early in the Andalite-Yeerk war, the planet was occupied by Andalite warships in orbit.