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Related Experiment Video

Updated: Jan 20, 2026

A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae
04:51

A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae

Published on: July 8, 2025

696

Interstellar ^{60}Fe in Antarctica.

Dominik Koll1, Gunther Korschinek1,2, Thomas Faestermann1,2

  • 1Physik-Department, Technische Universität München, 85748 Garching, Germany.

Physical Review Letters
|September 7, 2019
PubMed
Summary

Scientists detected recent extraterrestrial iron-60 (⁶⁰Fe) influx on Earth using Antarctic snow. This discovery provides new insights into cosmic events and interstellar material reaching our planet.

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Last Updated: Jan 20, 2026

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Area of Science:

  • Cosmochemistry
  • Astrophysics
  • Nuclear Physics

Background:

  • Earth accumulates extraterrestrial dust, offering clues to cosmic processes like stellar nucleosynthesis.
  • Long-lived radionuclides in this dust can trace past astrophysical events.

Purpose of the Study:

  • To report the first detection of recent iron-60 (⁶⁰Fe) influx to Earth.
  • To investigate the origin of extraterrestrial radionuclides found in terrestrial samples.

Main Methods:

  • Analysis of 500 kg of Antarctic snow using accelerator mass spectrometry.
  • Measurement of cosmogenic radionuclide ⁵³Mn alongside ⁶⁰Fe.
  • Elimination of terrestrial sources like global fallout.

Main Results:

  • Detection of a ⁶⁰Fe/⁵³Mn atomic ratio of 0.017, significantly exceeding cosmogenic production levels.
  • Exclusion of terrestrial origins for the detected ⁶⁰Fe excess.
  • Attribution of the excess ⁶⁰Fe to interstellar sources.

Conclusions:

  • This study provides the first evidence of a recent influx of interstellar ⁶⁰Fe onto Earth.
  • The findings suggest the ⁶⁰Fe may originate from the solar neighborhood.
  • This opens new avenues for studying recent cosmic events and material transfer.