Of these luminaries, Sandage had perhaps the most profound effect on the audience. He described several of the lines of evidence supporting the big bang theory, including his own discoveries confirming the linear relationship between the distance to far-flung galaxies and their recessional velocities. After serving as a graduate assistant to Edwin Hubble and earning his PhD at Caltech under Walter Baade, Sandage continued the work of Hubble, refining the understanding of the Hubble relationship between recessional velocity and distance as it applied to galaxies in all quadrants of the night
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