Planets can be viewed as potentially complete systems patterned after the manner of the solar system they reside in. Solar systems in turn are patterned after even greater systems which support them and so on. Microcosmically, our atoms follow suit. Just as there are at least ten major circuits or layers to our solar system, each occupied by a planet, so there are are also at least ten major circuits or layers to planet Earth. Since the Earth is hollow, most of these layers are not visible, yet they are still there. Earth's inner central sun can be likened to our solar system Sun. It sustains our planet(drawing upon the parent Sun) just as the greater Sun sustains our solar system planets. Earth's inner sun is some 600 to 700 miles in diameter and can be considered a planet in it's own right. The innermost layers of our planet are represented by the four terrestial planets -Mercury, Venus, Earth, and Mars. The nature of each of these layers is described by the respective nature of the planets with which they are linked to. I do not as yet have any specific information on these innermost layers or spheres, The Jupiter layer or zone occupies the concave surface and it's atmosphere which is rich in the life force making everything grow huge and healthy. Jupiter is after all the planet of growth and expansion in astrology. It explains why people and animals here are giant and live many hundreds of years old. The Saturn zone is none other than the Earth's crust or shell which is said to vary between 400(near the poles) and 800(near the equator) miles thick. The interior of Earth's shell is multi-layered and inhabited by all sorts of Saturnian or even "satanic" entities and races, and is better known as Middle Earth. Saturn of course rules hardness and boundaries in astrology and that is exactly the nature or purpose of our planet's shell. Uranus is the Earth's atmosphere or electrosphere and the home of rebel man. Both freedom and chaos dominate here. Anyone can do anything, whether it's good or bad, which pretty much sums up the nature of Uranus and the outer surface we live on. Neptune is the planet's magnetosphere or astral zone which is where most of us go when we sleep or die. It has many divisions or sub-layers, accomodating all soul types and situations. Neptune is after all the planet of sleep or psychic activity. Pluto represents the blackness, stillness, and darkness of outer space. There is said to be a ring of almost inpenetrable darkness just beyond the Earth's atmosphere which extends for thousands of miles and which is the home of dark entities. Pluto is of course death and the underworld in astrology.