Remember Harlow Shapley [1885-1972] and Heber Curtis [1872-1942] debates. Here are two papers by Shapley and Curtis as published in the Bulletin of the National Research Council [Volume 2, Part 3, Number 11, May 1921].
The Scale of the Universe, Harlow Shapley
Dimensions and Structure of the Galaxy, Heber Curtis
Astronomers and public perception
"The Day We Found the Universe"--H. Shapley & the Milky Way
"The Great Debate" [1921]--Shapley & Curtis
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