Researchers detected tiny traces of iron-60 in 295 kilograms of Antarctic ice covering roughly 40,000–81,000 years ago. This rare isotope can be produced in supernovae. The measured signal was only slightly above expected cosmic-ray production; comparing it with younger records suggests changes in the Solar System’s local interstellar environment. Ancient ice can preserve clues to our journey through space.
Sources:
https://doi.org/10.1103/nxjq-jwgp
https://youtube.com/shorts/_MaA_KyxBg4
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