Question

if there is no oxygen in space then why sun is burn

Answer 1

Because the sun can burn with hidrogen to helium without any need of oxygen

May be my answer will help you

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Answer 2

As we know that oxygen for burning. in the space there is no reason after that also the sun burns. the reason is that the sun contains the helium gas inside its core which helps it to burn, even if there is no oxygen.

hope it'll help...