AI Insight
An international research team led by the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) has confirmed, through analysis of Antarctic ice cores tens of thousands of years old, that Earth is continuously accumulating iron-60, a rare radioactive isotope produced by stellar explosions. This accumulation occurs because our solar system is currently traveling through the Local Interstellar Cloud, a diffuse region of gas and dust situated between star systems. The steady but time-varying influx of iron-60 suggests the isotope has been preserved within this cloud since a distant supernova event in the past.
Why it matters
This finding provides direct physical evidence of Earth's ongoing interaction with its broader galactic environment and helps scientists better reconstruct the history of nearby stellar explosions. It also demonstrates that Antarctic ice cores serve as valuable archives not only for climate data but also for cosmic particle records.
Our solar system is currently passing through the Local Interstellar Cloud, a region of highly diluted gas and dust between the stars. On its path, Earth continuously accumulates iron-60, a rare radioactive isotope of iron produced in stellar explosions. This has now been confirmed by an international research team led by the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) through the analysis of Antarctic ice tens of thousands of years old. From the steady but time-varying influx, the researchers conclude that the radioactive isotope has been stored within the cloud since a long-past stellar explosion. The results have been published in the journal Physical Review Letters.