"Antarctic ice contains evidence that Earth entered an interstellar dust cloud more than 40,000 years ago1."
"Other sections of the core hold very low levels of iron-60, which is found in interstellar dust."
"Antarctic ice contains evidence that Earth entered an interstellar dust cloud more than 40,000 years ago. Other sections of the core hold very low levels of iron-60, which is found in interstellar dust."
Antarctic ice contains records of past environmental conditions on Earth. Other parts of an Antarctic ice core show very low levels of iron-60. Iron-60 is associated with interstellar dust. The presence of this signal in the ice indicates that Earth entered an interstellar dust cloud more than 40,000 years ago. This provides a timeline for when interstellar material reached Earth’s environment. The ice core therefore preserves evidence of interactions between Earth and interstellar dust over long timescales.
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