Why does Jupiter have radiation?
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it got uranium and other radioactive elements from the “space dust” as it formed into planets and the star. Uranium is heavy and Jupiter is far from the sun, so probably it probably got less of uranium than earth (in relative terms), but it still has some.
in addition, there might be some nuclear fusion going on in there, since gas giants would turn into a star if they had more mass, and fusion is what happens in the stars.
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