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In theory, yes.

Neptune is a gas giant composed of hydrogen, helium and methane.

Hydrogen and helium are extremely flammable, while methane is mildly flammable.

However, Neptune is also a very stormy (windy) and extremely freezing planet, so these characteristics would easily extinguish any flames.

If Neptune ignited and managed to stay ignited, it would become a second sun in our solar system, until it runs out of gas to burn. Which could be extremely disastrous for nearby planets and moons.

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12y ago

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