Word: o16
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Dates: during 1970-1979
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...Mexico in 1969. Tiny grains of dust imbedded in the chips contained an isotope of oxygen (oxygen 16) in virtually pure form. Ordinary oxygen in the earth's atmosphere−and presumably that on the sun and other members of the solar system−also consists mostly of O16. But it also contains small amounts of other isotopes−oxygen 17 and 18, which were apparently formed later in the sun's history. To the Chicago researchers, the implications are very exciting: the grains may well predate the formation of the solar system and trace back to interstellar...