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" ... Elements such as carbon, nitrogen, oxygen, silicon, up to and including iron are created during the brief lives of massive stars, the author notes which she writes is crucial to enrichment of the interstellar medium and the formation of second and third generation stars like our own Sun. By the late 1950s, observations at Palomar were revolutionizing our understanding of how heavy elements are formed. In a 1957 Reviews of Modern Physics paper, “Synthesis of the Elements in Stars,” the authors proposed a sweeping theory of nucleosynthesis within dense, hot stellar interiors. ... "
" ... If we confidently want to know what the Universe is made of, we have to ensure we test it in every way plausible. Although it was one of the earliest predictions to arise from the hot Big Bang scenario, the nucleosynthesis of the light elements has often been derided by portions of the community as being too imprecise to draw meaningful conclusions from. With the latest observations and experiments, it’s clear that time has passed. The Universe has only 4.7-5.0% normal matter in it, and the rest, in some form or other, is truly dark. ... "
" ... It's worth pointing out that this is a clever idea, and one that isn't ruled out for the conventional reasons you might think. Typically, dark matter cannot be normal matter (made out of Standard Model particles) because we know how much normal matter must have been present during the early stages of the Universe when the light elements were formed: during nucleosynthesis. But this scenario at least evades that bound by "locking up" this normal matter during a pre-nucleosynthesis stage, allowing the light elements to be created without interference from this dark form of normal matter. ... "