Question

if fire need oxygen but how sun burns in a space​

Answer 1

A fire cannot burn without oxygen. ... So, the Sun can "burn" hydrogen to helium without the need for oxygen. It should be noted that in the presence of carbon, nitrogen and oxygen, stars heavier than the Sun may burn hydrogen to helium by using the C, N and O as catalysts.

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Answer 2

In sun huge amount of Atomic Fusion occurs perday in result high heat is evolve .

as we know Sun is made up of Hydrogen and Helium .