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Ancient Star Reveals Secrets of Early Universe's Chemistry

3/23/2026

Summary

Story summary

PicII-503, an ancient star in the dwarf galaxy Pictor II about 150,000 light-years from Earth, has extremely low iron and a carbon-to-iron ratio more than 1,500 times solar.
The star is over 10 billion years old, making it among the most chemically primitive stars.
The findings illuminate the early universe's stellar explosions and the formation of carbon.
The study, published in Nature Astronomy, underscores how small galaxies preserve chemical records.

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Story summary

PicII-503, an ancient star in the dwarf galaxy Pictor II about 150,000 light-years from Earth, has extremely low iron and a carbon-to-iron ratio more than 1,500 times solar.
The star is over 10 billion years old, making it among the most chemically primitive stars.
The findings illuminate the early universe's stellar explosions and the formation of carbon.
The study, published in Nature Astronomy, underscores how small galaxies preserve chemical records.