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Celestial Album
Young supernova Cassiopeia A
04/16/13

 

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. Credit: NASA/JPL-Caltech/STScI/CXC/SAO

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