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Answer to Question #69606 in Astronomy | Astrophysics for Afroz

Question #69606
If fire needs oxygen then how sun is burning in space? As there is no oxygen in space.
Expert's answer
Answer. The answer is much simpler than it seems. Sun “burns”, i.e. emits light and creates heat because of thermonuclear reactions [1]. Fire “burns”, i.e. emits lite and produces heat because of chemical reactions [2]. Thermonuclear reactions are due do interactions of atomic nuclei, and chemical ones are due to interactions of molecules, so that is the main difference.
[1] https://en.wikipedia.org/wiki/Sun#Structure_and_energy_production
[2] https://en.wikipedia.org/wiki/Fire

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