Indeed, it is the new record holder for the star with the smallest complement of heavy elements — it has about the same heavy element content as the planet Mercury. In contrast, our Sun is generations down that line and has a heavy element content equal to 14 Jupiters.
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That sentence can easily be misinterpreted. They should give percentages instead.
He must assume everyone knows the metal content of the planets in our solar system.
BTW, Jupiter has a metallic HYDROGEN core just to further confound the system.
Glad someone else noticed.
I have no idea what that sentence means.