“It is said in the Vedic literature that innumerable universes issue forth when Maha-Vishnu exhales in His yoga-nidra, and innumerable universes enter His body when He again inhales. We have to imagine that these universes, which, according to our limited knowledge, are expanded unlimitedly, are so great that the gross ingredients, the five elements of the cosmic manifestation, namely earth, water, fire, air and sky, are not only within the universe, but are covering the universe in seven layers, each layer ten times bigger than the previous one.” (Krishna, The Supreme Personality of Godhead, Vol 2, Ch 32)