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According to the current theories of the origin of the universe, pretty much all matter at the birth of the universe was in the form of hydrogen. The hydrogen then coalesced into stars where the Hydrogen was fused into heavier atoms. The heavy atoms accumulated in the core of the early stars until they went nova and spewed all that stuff out into interstellar space. After lots of time, new star systems developed, and some of the matter in them consisted of those heavy elements from earlier supernovas.

Basically, all elements heavier than hydrogen were belched out by long-gone stars. You are composed of stardust.

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14y ago

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Supernovae are essential for our existence because it distributed elements heavier than helium (those heavy elements are created in the star that later became the supernova) into the space. Those elements include carbon, oxygen, calcium, iron, iodine, and much more. Without those heavy elements, the Earth would not exist as a rocky planet, and essential elements for life would also not be available.


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