Fundamentals of Solar Radiation
Having been admonished by the Holy Office [the Inquisition] entirely to abandon the false option that the Sun was the center of the universe and immovable, and that the Earth was not the center of the same and that it moved … I abjure …
Galileo
10.1Physics of the Sun and Its Energy Transport
The nature of energy generation in the sun is still an unanswered question. Spectral measurements have confirmed the presence of nearly all the known elements in the sun. However, 80% of the sun is hydrogen and 19% helium. Therefore, the remaining 100-plus observed elements make up only a tiny fraction of the composition of the sun. It is generally accepted that a hydrogen-to-helium thermonuclear reaction is the source ...
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