Antarctic Ice Unveils Cosmic Clues: Iron-60 Traces 80,000-Year-Old Stellar Events

---

In a groundbreaking discovery, researchers have found traces of iron-60, a rare radioactive isotope, in Antarctic ice, offering insights into ancient cosmic events. German astrophysicists led by Dominik Koll from the Helmholtz-Zentrum Dresden-Rossendorf identified this interstellar marker, which cannot form naturally on Earth and is believed to originate from supernova explosions of massive stars.

The study utilized ice cores analyzed through the European Project for Ice Coring in Antarctica (EPICA). By melting sections of these cores, researchers counted iron-60 atoms atom-for-atom. The observed concentrations exceeded background levels, confirming a cosmic origin. This method revealed traces dating back 40,000 to 81,000 years ago.

This discovery highlights the role of space as an archive for supernova-produced isotopes. Iron-60 serves as a cosmic fingerprint, providing clues about stellar events and our solar system's journey through interstellar clouds. This research not only deepens our understanding of cosmic history but also underscores the value of Earth's polar ice in preserving ancient astronomical records.