Prabhupāda: My authority is Vedic literature, yes. You'll find Bhagavad-gītā... You have seen our book Bhagavad-gītā?
Journalist: Yes. We have it at the office. I've seen it.
Prabhupāda: There are descriptions. There are descriptions of these things. There is description of another nature which is called spiritual nature. This is material nature. The sky, as far as you can see, this is one universe. Similarly, there are millions of universes. And all these together, that is material sky. And beyond that, there is spiritual sky, which is far, far greater than this. And there are spiritual planets. So this information we have got from Bhagavad-gītā, what to speak of other Vedic literatures.