The planet Kurush` is a rather strange planet. It seems that it is a "Force Nexus". What this means is that the Midi-Chlorian level of the planet itself quite high. It has been theorized that the Jei and the Su`th are basically parts of Kurush` that have gained a level of seintience similiar to that of the other species of the galaxy. This theory will most likely never be proved, or disproved, because the Jei and Su`th will not talk about this and visitors to the planet itself are few and far between as Kurush` leaves visitors feeling very unwelcome.
Kurush`
Su`th
Jei