Professor Emeritus of Chemistry and Biochemistry at Northern Arizona University. Over the last few months, Dr. Ketterer has collected and analyzed plutonium levels from a trailhead at Acid Canyon ...
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Supernova graveyard? 10 million years ago, neutron stars crashed on Earth, reveal tracesDo we live in a supernova graveyard? A team of researchers proposes that 10 million years ago two giant neutron stars crashed ...
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