Why is the iron in human blood linked to past supernova events?
Answer
It was manufactured in the core of a star that exploded billions of years ago
All heavy elements present on Earth, including the iron found in human blood and the calcium in bones, were forged in the centers of stars. These elements were scattered across space when those stars reached the end of their lifespans and exploded. This recycled matter eventually coalesced to form our solar system and planets, meaning the building blocks of life are literal fragments of ancient stellar deaths.
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