Those who are in the platform of goodness, they worship nārāyaṇa-kalāḥ śāntāḥ, Nārāyaṇa and His expansion. In the spiritual world, there are innumerable Vaikuṇṭha planets. As we have got experience within this material world, within this universe, there are innumerable planets, similarly, there is another sky. Paras tasmāt tu bhāvo 'nyo 'vyakto 'vyaktāt sanātanaḥ (BG 8.20). That sky is eternal. This sky is not eternal. It is created. It has got a date of creation, and it will be annihilated at a certain date.
So beyond the sky there is another sky, which is called paravyoma, or sanātana, eternal sky. And in that sky there are innumerable Vaikuṇṭha planets. Vaikuṇṭha means vigata-kuṇṭha hy asmāt: there is no anxiety. Here in this material world everyone is full of anxiety. This is the material nature. Even a small bird—you give some grains to the small bird, he'll be full of anxiety. He'll look like this, look like this. Yes. "If somebody's coming to kill me? Somebody's coming to kill me?"
That is explained by Prahlāda Mahārāja: sadā samudvigna-dhiyām asad-grahāt (SB 7.5.5). The living entities in this material world, they are full of anxieties. Why? Asad-grahāt. Because they have accepted something which will not exist. Asad-grahāt. There are two things, asat and sat. So oṁ tat sat. Paraṁbrahma Bhagavān, He's sat. And this material world, asat. Asat means "that which does not exist."