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Śrī Īśopaniṣad
demigods can go to the planets of the respective demigods. The Moon worshipers can go to the Moon, the Sun worshipers can go to the planet of the Sun, and so on. Modern scientists are now trying to go to the Moon with the help of rockets, which is not really a new attempt. The human being with his advanced consciousness is naturally inclined to travel in outer space and to reach other planets, either by sputniks, by mystic powers, or by worshiping the particular predominating deity on that planet. In the Vedic scriptures it is said that one can reach other planets in any of the ways mentioned above, most generally by worshiping the demigod presiding over the particular planet. But these planets are temporary residential places; the only permanent planets are the  Vaikuṇṭha-lokas , found in the spiritual sky, where the Personality of Godhead predominates. The  Bhagavad-gītā  confirms this as follows:
Even though one may rise to the highest planet,  Brahma-loka , one has to come back again. But if someone attains to Me (in the spiritual world), he doesn't have to take birth again.
Śrī Īśopaniṣad suggests that one remains in the darkest region by hovering over the material planets, whatever his means may be. The whole universe is covered by the gigantic material elements, just like a coconut ball half-filled with water. As it is airtight and fully covered, the darkness within is dense, and therefore planets like the Sun and the Moon are required to illuminate the inside of the universe. Outside the universe there is a vast expansion of unlimited  Brahma-jyoti  space, full of  Vaikuṇṭha-lokas .
The biggest and the highest planet in the  Brahma-jyoti  is the  Kṛṣṇa-loka , or  Goloka  Vṛndāvana, where the Personality of Godhead, Śrī Kṛṣṇa, resides. Lord Śrī Kṛṣṇa never quits this  Kṛṣṇa-loka  where He dwells with His eternal associates, and yet He is omnipresent throughout the complete material and spiritual