However, there exists a one-third part (Av. Aiwithrishwa) which is separated from the perceptible earth.
The cosmos is divided into 2 main universes, Hasti – the Immortal Universe (Av. Haithyeng Asti, Yasna 43.3) and Nisti – the Mundane Universe. Hasti is composed of nine Immortal Heavens arranged concentrically one over the other, made up entirely of Immortal Light and the Divine Munificence. Bridging the expanse between the Immortal and Mundane Universes lies the Great Separator, called Mino Karko (Av. Miswane Gatu) which contains within it the four Atmospheric Oceans (Av. Zraya). The Mundane Universe consists of seven planes or climes called Dakhyu. Each of these Dakhyus has several intervening sub-planes, and each of these sub-planes contains innumerable globes, like our own Earth. The top six Dakhyus are beyond human perception, but the seventh Dakhyu is perceivable and visible in the lower area. Our Earth, called Geti, is located somewhere on the second or third sub-plane of the last Dakhyu, called Aipi Dakhyu. Our earth is divided into 2 parts. Nearly two-thirds of the earth is perceptible to us and is populated by humans and our entire civilisation with its accompanying pollution. However, there exists a one-third part (Av. Aiwithrishwa) which is separated from the perceptible earth.
These are the spiritual sages and adepts, known in Zoroastrian mysticism as the Abeds, who live in consonance with nature, who talk to nature, to whom nature reveals itself in all its splendorous beauty. Those few who are fortunate to come into contact with these Masters of the Heart (Saheb-e-Dilan) are taught the knowledge of understanding the workings of nature, which goes beyond the pale of modern science and its discoveries