Supernova Cassiopeia A Explosion Remnant
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Found the image in "Imgur Space Facts Part 2": http://imgur.com/gallery/MDOq2
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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.