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Šri Caitanya-caritāmrta
[[Madhya-lila]] Ch 19
eita brahmāṇḍa bhari’ ananta jīva-gaṇa caurāśī-laksa vonite karave bhramana
SYNONYMS
ei-ta —in this way;  brahmāṇḍa —the whole universe;  bhari’ —filling;  ananta —unlimited;  jīva-gaṇa —living entities;  caurāśī-lakṣa —8,400,000;  yonite —in species of life;  karave —do;  bhramana —wandering.
TRANSLATION
“In this universe there are limitless living entities in 8,400,000 species, and all are wandering within this universe.
PURPORT
This is a challenge to so-called scientists and philosophers who presume that there are living entities on this planet only. So-called scientists are going to the moon, and they say that there is no life there. This does not tally with Śrī Caitanya Mahāprabhu's version. He says that everywhere within the universe there are unlimited numbers of living entities in 8,400,000 different forms. In  Bhagavad-gītā  (2.24) we find that the living entities are  sarva-gataḥ , which means that they can go anywhere. This indicates that there are living entities everywhere. They exist on land, in water, in air, in fire and in ether. Thus there are living entities in all types of material elements. Since the entire material universe is composed of five elements—earth, water, fire, air and ether—why should there be living entities on one planet and not others? Such a foolish version can never be accepted by Vedic students. From the Vedic literatures we understand that there are living entities on each and every planet, regardless of whether the planet is composed of earth, water, fire or ether. These living entities may not have the same forms that are found on this planet earth, but they have different forms composed of different elements. Even on this earth we can see that the forms of land animals are different from the forms of aquatics. According to the circumstance, living conditions differ, but undoubtedly there are living entities everywhere. Why should we deny the existence of living entities on this or that planet? Those who have claimed to have gone to the moon have not gone there, or else their imperfect vision cannot actually perceive the particular type of living entities the
Living entities are described as  ananta , or unlimited; nonetheless, they are said to belong to 8,400,000 species. As stated in the  Vișņu Purăņa :
jalajā nava-lakṣāṇi sthāvarā lakṣa-viṁśati kṛmayo rudra-saṅkhyakāḥ pakṣiṇāṁ daśa-lakṣaṇam