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  • (James St. John, Wikimedia Commons)
    How Old Is Cosmic Dust?
    Walker Rhea
    By studying various kinds of rocks, scientists know that our solar system is about 4.6 billion years old. However, in 2019 an international team of researchers reported that they found tiny grains of dust in a meteorite that fell in Australia in 1969 that may be 7 billion years old.