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100th Anniversary of the Shapley – Curtis Great Debate

1920: Scale of the Universe Debate History & brief summaries: About the 1920 Greate Debate | Wikipedia | This Month in Astronomical History | Astronomy’s Great RemembranceVirginia Trimble: History of…

  • 1920 Great Debate between Harlow Shapley and Heber Curtis debated universe's scale and structure
  • Shapley argued Milky Way centered on our galaxy, Curtis proposed Milky Way as one of many galaxies
  • Discovery of Cepheid variables in Andromeda proved it was separate galaxy, not Milky Way cloud

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