Any planet, wherever you want to go . . . of course, you may try to go there by sputnik, but we have no such mention in the śāstras that you can manufacture some machine and you can go there. You have to qualify yourself. You have to qualify yourself. Just like even there is machine, jet plane, still, you require the visa to enter into America or any other country, similarly, even if you can manufacture some machine, although it is not possible, but you have to qualify yourself to be a resident in the better planets.
So those who are after going to the better planets—sun planet, moon planet, and heavenly planet . . . there are many. Svargaloka, Janaloka, Tapoloka, Maharloka. They are in Sanskrit names. So here it is mentioned, trai-vidyā soma-pāḥ pūta-pāpāḥ. They, after preparing themselves to be transferred in other planets, they become free from all sinful reaction.
The higher planet, as you go, you have to become free from sinful action. The lower-grade life and higher-grade life in this material world means those who are proportionately less sinful, they are promoted in higher planets. You cannot be free from sinful reaction in this material world. There will be some portion, some percentage. So the higher-grade life and lower-grade life means those who are proportionately greater sinful, they have got lower-grade life, and those who have got greater pious life, they get higher-grade life in higher planets, in Brahmaloka, Janaloka, Tapoloka.
Tapoloka means those who have performed here severe penances, and they are transferred there in Tapoloka. In Tapoloka, when there is destruction, annihilation of this material world, in the Tapoloka there is no destruction. They get information, "Now annihilation has begun." There is a great fire, and they still feel that heat, and at that time they transfer themselves to the spiritual sky. That mention we have got. So yajñair iṣṭvā svargatiṁ prārthayante.