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Fire is a chemical reaction which requires significant quantities of atmospheric oxygen (and also heat, and fuel). In our solar system, Earth would be the only planet capable of sustaining fire in its familiar form, but even so, fuel would be so limited that one could not fairly characterize that the planet itself would be "set on fire."

Sometimes the Sun is notionally considered to be like fire, or "burning", but the nuclear fusion processes underway in its core have a much higher characteristic energy than the chemical reactions of fire, so it remains only a metaphor.

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11y ago

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