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What is a fundamental, world-class scientific discovery about thermonuclear reactions in the Sun?

What groundbreaking finding in stellar physics first revealed how thermonuclear fusion works within the Sun?

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By Mukesh B Answered 8 months ago

The foundational discovery is the detailed understanding of the proton-proton chain and CNO cycle, which are the fusion processes that power the Sun. This was built upon Hans Bethe's 1938 Nobel-winning work. A modern world-class achievement is the detection of solar neutrinos (e.g., by the Sudbury Neutrino Observatory), which directly confirmed these theoretical models and solved the "solar neutrino problem," providing direct evidence of fusion in the Sun's core.

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