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
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