Fact Checking
Well-Known Member
By a molar-percentage, humans are 62% hydrogen (by a mass perspective, only 10%), and by far, most hydrogen in the universe comes from Big Bang nucleosynthesis, not stellar fusion reactions. That doesn't mean that our hydrogen has never been in a star - most of it has surely passed through multiple stars - but little** of it was "born" in a star.
I think "star dust" generally refers to the matter supernovae leave behind, which form the interstellar "dust clouds" and that will be compacted both by other supernova explosions and by gravitational attraction as well - eventually resulting in new stars being formed.
So yes, we are all star dust.
The proper name is "interstellar dust particles" I believe.
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