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My very basic understanding of chemistry is you need an oxygen rich environment for something to be flammable. Hydrogen is flammable on earth because it combines with the oxygen in our atmosphere to cause a chemical reaction. Or something like that - I wasn’t very good at chemistry. I think earth is the only planet with a lot of oxygen because of the plant life that produces it. Or are you taking about nuclear explosion? Jupiter apparently is a failed star. It’s made up of the same elements as the sun but wasn’t quite big enough to produce the pressure and temperature needed to produce nuclear fusion and turn into a star.
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Are you taking about catching it on fire, or kick starting a nuclear reaction to create a second sun in our local solar system?
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https://www.quora.com/Can-hydrogen-burn-without-oxygen From the couple minutes of research and googling I just did to figure it out, it depends on what else is in Jupiter's atmosphere and how much is in it. For a flammable substance (hydrogen, in this instance), a proper amount of oxidizer needs to be present. The oxidizer can be oxygen, but it doesn't have to be; halogens can work just as well. But if there's isn't enough oxidizer, it won't last long enough to, say, combust the entire planet.
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