Namaste, a short explanation of this Divine illustration taken from the Srimad Bhagvatam.
1. In the centre we have the original spiritual planet, which resembles the whorl of a lotus flower, it is called Goloka Vrindavana. It is the abode of Lord Krishna, the original Personality of Godhead.
2. This original planet Goloka throws off a spiritual ray of effulgence called Brahmajyoti which is the ultimate goal of impersonalists.
3. Within the unlimited Brahmajyoti, there are unlimited numbers of spiritual planets, as there are innumerable material planets within the sun rays of the material universes. These spiritual planets are dominated by planetary expansions of Lord Krishna, and the inhabitants are ever-liberated beings. They are all four handed. The Lord is known there as Narayana, and the planets are known as Vaikunthas.
4. Sometimes a spiritual cloud overtakes a corner of the spiritual sky of Brahmajyoti, and the covered portion is called mahat-tattva. The Lord then, by His portion as Maha-Vishnu, lies down in the water within the maha-tattva. The water is called the Causal Ocean (karana-jala)
5. As he sleeps in the Causal Ocean, innumerable universes are generated with His breathing. These floating universes are scattered all over the Causal Ocean. They stay during a breath of Maha-Vishnu.
6. In each and every universal globe the same Maha-Vishnu enters again as Garbhodakasayi-Vishnu and lies there on the garbha ocean on the serpentine Sesa incarnation. From his navel-abdomen sprouts a lotus stem, and on the lotus, Brahma, the Lord of the universe, is born. Brahma creates all living beings of different shapes in terms of desires within the universe. He also creates the sun, moon and other demi-gods.
7. The sun is situated almost in the center of each and every universe, and distributes profuse light and heat all over the universe. There are millions and billions of suns of all the millions and billions of universes within the maha-tattva. The suns and moons are required within the universes because they are dark by nature. The Vedas instruct us to go out of the dark universes to reach the glowing effulgences, the Brahmajyoti.
8. The Brahmajyoti is due to the illuminating Vaikuntha planets, which need no sun or moon or power of electricity.
Srimad-Bhagvatam helps us to reach the supreme planet, Goloka Vrindavana. The door is open for all. Human life is meant for this particular aim, for it is the highest perfection.