Planes of Existence.

Mortal Plane: This are all the planets and stars in our solar system. Every thing here is regarded as a part of the mortal race and they are weaker and smaller than the Celestials.

Celestial Plane: This plane is where the celestials live. They are a group of super human beings who see mortals as lower beings. They are the strongest in all the planes - though not for long .. haha!