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Easy Journey to Other Planets
cosmic affairs are unseen by the gross materialists who reside on this seventh-class planet called “earth.”
Those who are not  yogīs  but who die at an opportune moment due to penances performed or pious acts or sacrifices, charity, etc., can rise to the higher planets after death, but are subject to return to this planet [earth]. Their going forth takes place at a period known as  dhūma , the dark, moonless half of the month in which the sun is on its southern path.
(Bg. 8.25)
In summary, the  Gītā  recommends that one adopt the means of devotional service, or anti-material activities, if one wishes to enter the anti-material world. Those who adopt the means of devotional service, as prescribed by the expert transcendentalist, are never disappointed in their attempts to enter the anti-material worlds. Although the obstacles are many, the devotees of Lord Kṛṣṇa can easily overcome them by rigidly following the path outlined by the transcendental devotees. Such devotees, who are passengers progressing in the journey of life towards the anti-material kingdom of God, are never bewildered. No one is cheated or disappointed when he adopts the guaranteed path of devotion for entrance into the anti-material universe. One can easily attain all the results that are derived from the studies of the  Vedas , performances of sacrifice, practices of penance and offerings of charities simply by the unilateral performance of devotional service, technically known as  bhakti-yoga .
Anti-material Worlds
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Bhakti-yoga  is therefore the great panacea for all, and it has been made easy to practice, especially in this iron age, by Lord Kṛṣṇa Himself in His most sublime, liberal and munificent appearance as Lord Śrī Caitanya (1486-1534), who appeared in Bengal and spread the  saṅkūrtana  movement—singing, dancing, and chanting the names of God—throughout India. By Lord Caitanya’s grace, one can quickly pick up the principles of  bhakti-yoga . Thus all misgivings in the heart will disappear, the fire of material tribulation will be extinguished, and transcendental bliss will be ushered in.
In the Fifth Chapter of the  Brahma-saṁhitā  there is a description of the variegated planetary system that is within the material world. It is also indicated in the  Gītā  that there are variegated planetary systems in hundreds of thousands of material universes, and that altogether these universes comprise only a fraction (one-fourth) of the creative energy of the Godhead. The majority (three-fourths) of the Lord’s creative energy is manifested in the spiritual sky called the  para-vyoma  or the  Vaikuṇṭhaloka . These instructions of the  Brahma-saṁhitā  and  Bhagavad-gītā  may be finally confirmed by the material scientist as he researches into the existence of the anti-material world.
In addition, a February 21st, 1960, Moscow news release reported:
Russia’s well-known professor of astronomy Boris Vorontsov-Velianino said that there must be an infinite number of planets in the universe inhabited by beings endowed with reason.