NASA/JPL-Caltech/STScI/CXC/SAO Oceanic sediment contains an iron isotope that ancient bacteria accumulated 2.2 million years ago when debris rained on Earth from a supernova explosion. Shown are the remnants of a much younger supernova remnant, Cassiopeia A, shown in a composite image from three NASA observatories.
A team from Germany and Austria has found possible evidence of iron from a supernova in sediment cores taken from the floor of the Pacific Ocean. The study began when team members came across information regarding magnetotactic bacteria during internet searches. It is a type of bacteria that lives in ocean sediments and absorbs tiny amounts of iron. As sediment builds, the bacteria die leaving behind bits of iron in the layers of sediment...
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