Force planet

A planet hidden in the glow of light emanating from inside it existed somewhere in the galaxy. It was the homeworld of the midi-chlorians, and the place where all life in the galaxy might have arisen. Its surface appeared barren and heavily damaged, but life was plentiful in large open spaces deep beneath the ground. The planet was hidden in the Force, and also appeared to negatively affect mechanical and electronic devices.

Near the end of the Clone Wars, the spirit of Qui-Gon Jinn sent Yoda to the planet so that he could learn how to preserve his consciousness after death from the Five Priestesses.