Into The Impossible

The GREATEST Debate: How two astronomers changed the way humanity debates By April 1920, the Spanish flu had claimed 50,000,000 lives. The first World War ended only 17 months earlier. A polarizing presidential election was underway. On April 26, 1920, in Washington DC, two contestants took the stage in a debate that would alter the cosmos forever. Was this contest the 1920 presidential debate? No, this battle was literally for universal domination, not a mere skirmish between presidential contenders Warren Harding and James Cox. Only the wonkiest history buffs recall who won 1920’s presidential debates. But every astronomer knows the two scientists sparring on that April evening at the Smithsonian Museum of Natural History, taking sides in astronomy’s “Great Debate”: Heber Curtis, director of the Allegheny Observatory, versus Mt. Wilson Observatory astronomer Harlow Shapley. The Debate’s outcome could not have been more consequential; the span of the entire universe was at stake. This epic contest concerned