In Western occultism Kether is the starting point of the Tree, and the whole material world is in Malkuth; the planets are reflections of the spheres in the material world, and so belong to Malkuth as well, so (for example) Venus is the reflection of Netzach in Malkuth, and the Sun is the reflection of Tiphareth in Malkuth. So there are ten entire worlds in the Western theory, and the other nine are all more spiritual than this one!