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Originally Posted by Michael Mozina
It seems to me that one of the primary reasons that hydrogen is presumed to be the most abundant element, and the primary reason that suns are presumed to be iron poor is because we ASSUME that all matter formed in the Big Bang. I'd like to question that most basic of assumptions for a moment.
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No the primary reason we assume the Sun is full of Hyrdrogen and Helium is that its spectrum shows a lot of both of them. We also assume Hydrogen is the most abundant element in the Universe because even excluding the stars there are still massive clouds of the stuff both in our Galaxy and inbetween galaxies.