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During the years from 1917 to 1921, A.S. Eddington was intensely occupiedwith Einstein's general theory of relativity and the epic eclipse expeditionwhich confirmed one of the theory's predictions. During the same period, heinvestigated the old problem of why the stars shine, which led him to suggesttwo different subatomic mechanisms as the source of stellar energy. One of themwas the annihilation of matter and the other the building-up of helium fromhydrogen. This paper is concerned with Eddington's work in this area, a line ofwork to which he returned on and off during the 1920s but then abandoned. Hisdecision to stop working on the stellar energy problem coincided with the firstattempts to understand the problem in terms of nuclear physics and quantummechanics. Why did Eddington not follow up his earlier work and why did heignore the contributions of the nuclear physicists which in the late 1930sresulted in the first successful theories of stellar energy production?

Reluctant Pioneer of Nuclear Astrophysics: Eddington and the Problem of Stellar Energy