4.5 billion-year-old particles from the sun lurk in Earth’s core and mantle


For the past 4.5 billion years, energized particles from the primordial sun have lurked in Earth’s core, a new study suggests.

Researchers made the discovery by analyzing ancient particles within an iron meteorite, which came from a space rock that had an iron core, just like Earth does now, making the meteorite a good proxy for our planet’s innards. The meteorite had “striking excesses of solar helium and neon,” which are noble gases, or gases that are colorless, odorless, tasteless and nonflammable and occupy group 18 on the periodic table, the researchers wrote in the study.



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