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As on this earth planet we have a multi variety of living entities, we can understand from Vedic literature that in the sun also there is a variety of living entities, but their bodies are made of fire, just as ours are made of earth. In material nature there are five gross elements: earth, water, air, fire and space.
In different planets there are different atmospheres due to one of these five elements prevailing, and there are different bodies for the living entities composed of whatever element may be predominant in a particular planet.
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A.C. Prabhupāda (On the Way to Krsna)