A century ago, astronomy’s Great Debate foreshadowed today’s view of the universe

The argument between Harlow Shapley and Heber Curtis was ultimately settled by Edwin Hubble

Harlow Shapley, Heber Curtis

On April 26, 1920, astronomers Harlow Shapley (left) and Heber Curtis (right) presented their views on the scope of the cosmos.

From left: Smithsonian Institution Archives, Accession 90-105, Science Service Records, Image No. SIA2008-5931; Rockefeller University

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