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Of the visible, baryonic matter in the universe, about 0.1% is not plasma, according to some hurried estimates. This includes the large gas giants, such as Saturn and Jupiter. Most all of the Sun's hydrogen and helium is ionized, and most of the interstellar medium as well.

However, ordinary matter, the stuff plasma is made up of, only constitutes about 5% of the total mass-energy of the universe. Some 27% is dark matter, and it is not known whether dark matter can form plasma of any kind. It's safe to say that less than 5% of the total mass-energy of the universe comes as baryonic plasma.

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12y ago

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