People my father knew

By devious ways over the past week I came to find a paper entitled  The 1920 Shapley-Curtis Discussion:Background, Issues, and Aftermath, Virginia Trimble. Publications of the Astronomical Society of the Pacific. Vol. 107, pages 1133-1144, December  1995 1995PASP..107.1133T This paper discusses something called The Great Debate of 1920 wherein two astronomers, Harlow Shapley and Heber [...]