SB 6.16.37
ksity-adibhir esa kilavrtah
saptabhir dasa-gunottarair anda-kosah
yatra pataty anu-kalpah
sahanda-koti-kotibhis tad anantah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Every universe is covered by seven layers — earth, water, fire, air, sky, the total energy and false ego — each ten times greater than the previous one. There are innumerable universes besides this one, and although they are unlimitedly large, they move about like atoms in You. Therefore You are called unlimited [ananta].
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The Brahma-samhita (5.48) says:
yasyaika-nisvasita-kalam athavalambya
jivanti loma-vilaja jagad-anda-nathah
visnur mahan sa iha yasya kala-viseso
govindam adi-purusam tam aham bhajami
The origin of the material creation is Maha-Visnu, who lies in the Causal Ocean. While He sleeps in that ocean, millions of universes are generated as He exhales, and they are all annihilated when He inhales. This Maha-Visnu is a plenary portion of a portion of Visnu, Govinda (yasya kala-visesah). The word kala refers to a plenary portion of a plenary portion. From Krsna, or Govinda, comes Balarama; from Balarama comes Sankarsana; from Sankarsana, Narayana; from Narayana, the second Sankarsana; from the second Sankarsana, Maha-Visnu; from Maha-Visnu, Garbhodakasayi Visnu; and from Garbhodakasayi Visnu, Ksirodakasayi Visnu. Ksirodakasayi Visnu controls every universe. This gives an idea of the meaning of ananta, unlimited. What is to be said of the unlimited potency and existence of the Lord? This verse describes the coverings of the universe (saptabhir dasa-gunottarair anda-kosah). The first covering is earth, the second is water, the third is fire, the fourth is air, the fifth is sky, the sixth is the total material energy, and the seventh is the false ego. Beginning with the covering of earth, each covering is ten times greater than the previous one. Thus we can only imagine how great each universe is, and there are many millions of universes. As confirmed by the Lord Himself in Bhagavad-gita (10.42):
athava bahunaitena
kim jñatena tavarjuna
vistabhyaham idam krtsnam
ekamsena sthito jagat
“But what need is there, Arjuna, for all this detailed knowledge? With a single fragment of Myself I pervade and support this entire universe.” The entire material world manifests only one fourth of the Supreme Lord’s energy. Therefore He is called ananta.