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    related to: sediment

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    • When Was Earth Last Struck by a Supernova?

      When Was Earth Last Struck by a Supernova?

      Scientific American· 3 days ago

      In this case, a supernova within about 160 light-years, or 1.5 quadrillion kilometers, would qualify. Iron 60 is a radioactive isotope of iron that...

    • Archaeologists work to find missing pilot

      Archaeologists work to find missing pilot

      BBC via Yahoo News· 7 days ago

      Expert say the excavation after 80 years "will not be easy". The crash crater is "waterlogged and filled with 80 years' worth of sediment" [Cotswold...