After the Lord entered each and every universe as the Garbhodakaśāyī Viṣṇu, half of the universe was filled with water. The cosmic manifestation of the planetary systems, outer space, etc., which are visible to us, is only one half of the complete universe. Before the manifestation takes place and after the entrance of Viṣṇu within the universe, there is a period of one thousand celestial years. All the living entities injected within the womb of the mahat-tattva are divided in all universes with the incarnation of Garbhodakaśāyī Viṣṇu, and all of them lie down with the Lord until Brahmā is born. Brahmā is the first living being within the universe, and from him all other demigods and living creatures are born. Manu is the original father of mankind, and therefore, in Sanskrit, mankind is called mānuṣya. Humanity in different bodily qualities is distributed throughout the various planetary systems.