Antarctic snow amid mountains
Antarctic snow is so pristine that we can spot interstellar dust in it

Gordon Wiltsie/Getty

Radioactive iron found buried in Antarctic snow must have come to Earth from interstellar dust, according to a new study. The finding suggests that Antarctic snow of different ages could be used to tell us about the patches of interstellar dust Earth has passed through, and so track it path across the Milky Way.

Dominik Koll at the Australian National University in Canberra and his colleagues collected 500 kg of Antarctic ice, melted it and studied what it contained. They found iron-60, a rare radioactive …

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View Article Here New Scientist – Earth