3 years ago
A century ago, astronomy’s Great Debate foreshadowed today’s view of the universe
Counting universes ought to be easy. By definition, you can stop at 1. Trouble is, definitions change. A century ago, the “universe” was defined as the Milky Way galaxy. Heretics who disagreed had long been ridiculed— until science staged what became known as the Great Debate, on April 26, 100 years ago. On that date, American astronomers Harlow Shapley and Heber Curtis articulated opposing views on the scope of the cosmos.
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