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Stars are grouped into three different populations based on their metallicity.

Population III stars (first protostar) are made up entirely of hydrogen and helium (with a very small amount of lithium). These stars created the first 26 elements up to iron via Nucleosynthesis. They are hypothetical, and were supposed to exist only in the early Universe, when there were only light elements. None exist today.

Population II stars (Early protostar) are made up of the remnants of a population III star and will contain relatively small amounts of metals. These stars, via a supernova created the rest of the elements, including gold.

Population I star (Current, including our Sun) are made up of all of the above and will have the highest metal content.

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