RE: Chemistry of the cosmos (Part-2)

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Nice blog. It was interesting to read. I, as for the last time, have a couple of comments.

  1. Note that the most abundant form of matter in the universe is not hydrogen, but dark matter. This is for some reason very often forgotten (maybe because it is off topic, somewhat ;) ).

  2. The fusion reaction you described is not the only occurring in the Sun. There are indeed several ways to produce helium-4 (see the proton-proton chains I, II and III). The one dominating in our Sun is the second chain, that proceeds through reactions involving beryllium.

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(Edited)

Thanks for these valuable notes Sir:
To be honest, I don't know enough about dark matter, therefore I'm reading your articles to understand more about it. However, most sources, particularly books, simply mention hydrogen as the most abundant substance in the universe. This is what made me think that hydrogen is the most prevalent substance in the universe, now I will correct my information and thank you very much

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However, most sources, particularly books, simply mention hydrogen as the most abundant substance in the universe

This is indeed the case. And this is true not only for books, but also for many scientists. This is however not completely true. It is the most abundant visible substance in the universe. The extra adjective makes a large difference, and renders the sentence correct :)

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