5
Paramparā: Knowledge Through Disciplic Succession
śrī bhagavān uvāca 
    imaṁ vivasvate yogaṁ 
    proktavān aham avyayam 
    vivasvān manave prāha 
    manur ikṣvākave 'bravīt
“The Blessed Lord said: I instructed this imperishable science of  yoga  to the sun-god, Vivasvān, and Vivasvān instructed it to Manu, the father of mankind, and Manu in turn instructed it to Ikṣvāku.” (Bg. 4.1)
Many ages ago Kṛṣṇa imparted the divine knowledge of  Bhagavad-gītā  to Vivasvān, the god of the sun. To the best of our knowledge, the sun is a very hot place, and we do not consider it possible for anyone to live there. It is not even possible to approach the sun very closely with these bodies. However, from the Vedic literatures we can understand that the sun is a planet just like this one but that everything there is composed of fire. Just as this planet is predominately composed of earth, there are other planets which are predominately composed of fire, water and air.
The living entities on these various planets acquire bodies composed of elements in accordance with the predominating element on the planet; therefore those beings who live on the sun have bodies which