Inthe 1920S Eddington Formulated the Hypothesis That Fusion Reactions Betweenlight Elements Are the Energy Source of the Stars- a Proposition That May Be Considered As Thebirth of the Field of Nuclear Astrophysics [1]. It Was Accompanied By Hispioneering Work on Stellar Structure Andradiation Pressure, the Relation Between Stellar Mass Andluminosity, and Many Other Astrophysical Topics.