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TEACHINGS OF QUEEN KUNTĪ
why do they come back here? If they knew perfectly what the moon is, they would have resided there by now. They have been trying for the last twenty years to go there and stay, but they are simply seeing, “Not this, not that. There are no living entities, and there is no possibility of our living here.” Thus they can report on what is  not  on the moon, but do they know what  is  there? No, they do not know. And this is only one planet or one star.
According to the Vedic literature, the moon is regarded as a star. The scientists say that the stars are all suns, but according to  Bhagavad-gītā  the stars are of the same nature as the moon. In  Bhagavad-gītā  (10.21) Lord Kṛṣṇa says,  nakṣatrāṇām aham śaśī : “Of stars I am the moon.” Thus the moon is just like the many stars. What is the nature of the moon? It is bright because it reflects light from the sun. Therefore although the scientists say that the stars are many suns, we do not agree. According to the Vedic calculation, there are innumerable suns, but in every universe there is only one.
What we see in this universe we are seeing imperfectly, and our knowledge is not perfect. We cannot count how many stars or planets there are. We cannot fully understand the material things existing all around us, and therefore how can we understand the Supreme Lord who created this universe? That is not possible. Therefore in the  Brahma-saṁhitā  (5.34) it is said:
panthās tu koṭi-śata-vatsara-sampragmyo vāyor athāpi manaso muni-puṅgavānām so 'py asti yat-prapada-sīmny avicintya-tattve govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
Space is unlimited, and the  Brahma-saṁhitā  suggests: Suppose one travels by spacecraft for millions of years at the velocity of the wind or even the speed of mind. Everyone knows that the mind is so swift that in even one ten-thousandth of a second it can take us millions of miles. If we have seen something millions of miles away, the mind can go there immediately. But even if we can travel at that speed on a spacecraft manufactured by  muni-puṅgavānām , the greatest scientists and most thoughtful men, will that be perfection? No. The  Brahma-saṁhitā  says,  so 'py asti yat-prapada-sīmny avicintya-tattve : still this creation will remain inconceivable to our understanding. And Kṛṣṇa has created all these things, so how can we study Kṛṣṇa? If we cannot understand the things Kṛṣṇa has created, how can we understand Kṛṣṇa? It is not possible at all.