What raw material constituted the Population III stars?

Answer

Almost purely hydrogen and helium.

The very first stars, designated as Population III stars, were formed under unique conditions predating significant element creation. Following the Big Bang and the subsequent cooling of the primordial plasma, the universe primarily consisted of the lightest elements. Therefore, these primordial stars were fundamentally built from a gas mixture that contained almost exclusively hydrogen and helium, with only negligible traces of elements heavier than helium, which astronomers classify as 'metals.' This composition is what distinguishes them starkly from modern stars like our Sun, which incorporate substantial amounts of heavier elements forged by previous stellar generations.

What raw material constituted the Population III stars?

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