In 1938 Hans Bethe propounded the nuclear-fusion sequences we confidently assume to describe the energy sources of the Sun. Almost a halfcentury later, a 24 March Physical Review Letter by this same Hans Bethe takes a swipe at the one conspicuous fly remaining in the ointment of the “standard solar model” that has grown up around his seminal explanation of what makes the stars shine.
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Bertram Schwarzschild (1986) studied this question.