Great Debate (astronomy)
ASTRONOMY DEBATE HELD ON 26 APRIL 1920 AT THE SMITHSONIAN MUSEUM OF NATURAL HISTORY BETWEEN HARLOW SHAPLEY AND HEBER CURTIS ABOUT WHETHER SPIRAL NEBULAE WERE DIFFERENT GALAXIES OR PART OF THE MILKY WAY
The great debate; Shapley-Curtis debate; Shapley-Curtis Debate; Shapley - Curtis Debate; Shapley–Curtis debate; Shapley–Curtis Debate
The Great Debate, also called the Shapley–Curtis Debate, was held on 26 April 1920 at the Smithsonian Museum of Natural History, between the astronomers Harlow Shapley and Heber Curtis. It concerned the nature of so-called spiral nebulae and the size of the universe.