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Supernova Cassiopeia A Explosion Remnant

Stashed in: Light, The Universe, NASA, Medium

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More explanation:

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.

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