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Easy Journey to Other Planets
states in  Bhagavad-gītā , "One can go to the moon, or one can even go to the sun or to millions and trillions of other planets, or if one is too materially attached he may remain here—but those who are My devotees will come to Me." This is our aim. Initiation into Kṛṣṇa consciousness insures that the student ultimately can go to the supreme planet, Kṛṣṇaloka. We are not working idly; we are also attempting to go to other planets, but we are not merely wasting time.
A sane and intelligent man does not wish to enter any of the material planets because the four conditions of material miseries exist on all of them. From  Bhagavad-gītā  we can understand that even if we enter Brahmaloka, the highest planetary system of this universe, the four principles of misery will be present. We learn from  Bhagavad-gītā  that the duration of one day on Brahmaloka is millions of years of our calculation. That is a fact.
Even the highest planetary system, Brahmaloka, may be reached, but scientists say that it will take 40,000 years at sputnik speed. Who is prepared to travel in space for 40,000 years? From the Vedic literature we can understand that we can enter any of the planets, provided we prepare for that purpose. If one prepares himself to enter into the higher planetary systems, which are said to be inhabited by demigods, he can go there. Similarly, one can go to a lower planetary system, or if one desires he can remain on this planet. Finally, if one desires, he can enter the planet of the Supreme Personality of Godhead. It is all a matter of preparation. However, all
Varieties of Planetary Systems
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planetary systems within our material universe are temporary. The duration of life on certain material planets may be very long, but all living entities in the material universe are eventually subject to annihilation and have to again develop other bodies. There are different types of bodies. A human body exists 100 years, whereas an insect body may exist for twelve years. Thus the duration of these different bodies is relative. If one enters the planet called Vaikunthaloka, the spiritual planet, however, he then achieves eternal life, full of bliss and knowledge. A human being can attain that perfection if he tries. That is stated in  Bhagavad-gītā  when the Lord says, "Anyone who knows in truth about the Supreme Personality of Godhead can attain to My nature."
Many people claim, "God is great," but this is a hackneyed phrase. One must know how He is great, and that can be known from authorized scripture. In the  Bhagavad-gītā  God describes Himself. He says, "My appearance of taking birth just like an ordinary human being is actually transcendental." God is so kind that He comes before us as an ordinary human being, but His body is not exactly like a human body. Those rascals who do not know about Him think that Kṛṣṇa is like one of us. That is also stated in  Bhagavad-gītā :
avajānanti mām mūdhā mānuṣīm tanum āśritam param bhāvam ajānanto mama bhūta-maheśvaram