Sir Arthur Stanley Eddington
1882-1944
English astronomer who was one of the founders of modern astrophysics. Eddington showed that, to avoid collapse, the outward gas and radiation pressure of a star must equal its inward gravitational pull.
This placed an upper limit of 50 solar masses on stable stars. Cepheid variable pulsation, he argued, was due to a star's instability. Eddington also established the mass luminosity law and led the 1919 solar eclipse expedition, which confirmed the gravitational bending of light.
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