It is stated in the Bhagavad-gītā (7.23) that the worshipers of the demigods can go to the planets of the demigods. The moon worshipers can go to the moon, the sun worshipers to the sun, etc. Modern scientists are now venturing to the moon with the help of rockets, but this is not really a new attempt. With their advanced consciousness, human beings are naturally inclined to travel in outer space and to reach other planets, either by spaceships, mystic powers or demigod worship. In the Vedic scriptures it is said that one can reach other planets by any one of these three ways, but the most common way is by worshiping the demigod presiding over a particular planet. In this way one can reach the moon planet, the sun planet and even Brahmaloka, the topmost planet in this universe. However, all planets in the material universe are temporary residences; the only permanent planets are the Vaikuṇṭhalokas. These are found in the spiritual sky, where the Personality of Godhead Himself predominates. As Lord Kṛṣṇa states in the Bhagavad-gītā (8.16):
- ābrahma-bhuvanāl lokāḥ
- punar āvartino 'rjuna
- mām upetya tu kaunteya
- punar janma na vidyate
"From the highest planet in the material world down to the lowest, all are places of misery wherein repeated birth and death take place. But one who attains My abode, O son of Kuntī, never takes birth again."
Śrī Īśopaniṣad points out that one who worships the demigods and attains to their material planets still remains in the darkest region of the universe. The whole universe is covered by the gigantic material elements; it is just like a coconut covered by a shell and half-filled with water. Since its covering is airtight, the darkness within is dense, and therefore the sun and the moon are required for illumination. Outside the universe is the vast and unlimited brahmajyoti expansion, which is filled with Vaikuṇṭhalokas. The biggest and highest planet in the brahmajyoti is Kṛṣṇaloka, or Goloka Vṛndāvana, where the Supreme Personality of Godhead, Śrī Kṛṣṇa Himself, resides. Lord Śrī Kṛṣṇa never leaves Kṛṣṇaloka. Although He dwells there with His eternal associates, He is omnipresent throughout the complete material and spiritual cosmic manifestations. This fact has already been explained in Mantra Four. The Lord is present everywhere, just like the sun, yet He is situated in one place, just as the sun is situated in its own undeviating orbit.
The problems of life cannot be solved simply by going to the moon planet or to some other planet above or below it. Therefore Śrī Īśopaniṣad advises us not to bother with any destination within this dark material universe, but to try to get out of it and reach the effulgent kingdom of God. There are many pseudo worshipers who become religionists only for the sake of name and fame. Such pseudo religionists do not wish to get out of this universe and reach the spiritual sky. They only want to maintain the status quo in the material world under the garb of worshiping the Lord. The atheists and impersonalists lead such foolish pseudo religionists into the darkest regions by preaching the cult of atheism. The atheist directly denies the existence of the Supreme Personality of Godhead, and the impersonalists support the atheists by stressing the impersonal aspect of the Supreme Lord. Thus far we have not come across any mantra in Śrī Īśopaniṣad in which the Supreme Personality of Godhead is denied. It is said that He can run faster than anyone. Those who are running after other planets are certainly persons, and if the Lord can run faster than all of them, how can He be impersonal? The impersonal conception of the Supreme Lord is another form of ignorance, arising from an imperfect conception of the Absolute Truth.