At the critical time of death, one can place the vital force between the two eyebrows and decide where he wants to go. If he is reluctant to maintain any connection with the material world, he can, in less than a second, reach the transcendental Vaikuṇṭha and appear there completely in his spiritual body which will be suitable for him in the spiritual atmosphere. He has simply to desire to leave the material world in both finer and grosser forms and then move the vital force to the topmost part of the skull and leave the body from the hole in the skull called the brahma-randhra. This is the highest perfection in the practice of yoga.
Of course man is endowed with free will, and as such if he does not want to free himself of the material world he may enjoy the life of brahma-pāda (occupation of the post of Brahmā) and visit Siddhaloka, the planets of materially perfect beings who have full abilities to control gravity, space, time, etc. To visit these higher planets in the material universe, one need not give up his mind and intelligence (finer matter), but need only give up grosser matter (the material body).
Man-made satellites and mechanical space vehicles will never be able to carry human beings to the planets of outer space. Men cannot even go on their much-advertised trips to the moon, for, as we have already stated, the atmosphere on such higher planets is different from the atmosphere here on earth. Each and every planet has its particular atmosphere, and if one wants to travel to any particular planet within the material universe, one has to have a material body exactly adapted to the climatic condition of that planet. For instance, if one wants to go from India to Europe, where the climatic condition is different, one has to change his dress accordingly. Similarly, a complete change of body is necessary if one wants to go to the transcendental planets of Vaikuṇṭha.
If one wants to go to the higher material planets, he can keep his finer dress of mind, intelligence and ego, but has to leave his gross dress (body) made of earth, water, fire, etc. When one goes to a transcendental planet, however, it is necessary to change both the finer and gross bodies, for one has to reach the spiritual sky completely in a spiritual form. This change of dress will take place automatically at the time of death if one so desires. But this desire is possible at death only if the desire is cultivated during life. Where one's treasures are, there also is one's heart. When one practices devotional service, one cultivates a desire for the kingdom of God. The following details outline a general practice by which one can prepare himself for an easy journey to the Vaikuṇṭha (antimaterial) planets, where life is free from birth, old age, disease and death.