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Great Debates in Astronomy

Following in the footsteps of the famous April 1920 ‘Great Debate’ between Harlow Shapley and Heber Curtis, this series of debates among leaders in the astronomical community highlight major quests in astronomy and astrophysics in an open forum at the turn of the millennium. Each of the 20th century debates were held in April in […] The post Great Debates in Astronomy appeared first on NASA…

Great Debates in Astronomy

The Great Debates in Astronomy series, inspired by the historic 1920 "Great Debate" between Harlow Shapley and Heber Curtis, brings together leaders in the astronomical community to explore major quests in the field. This series, held at the Smithsonian's Museum of Natural History since 1920, marks its 100th anniversary in 2020 with the "Life in the Universe" debate, which was conducted online due to the pandemic.

The debate question for the 2020 event was "How will humanity first discover extraterrestrial life?" Each debate features background information, educational material, and published proceedings, with contributions from many contributors in 2020.

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Great Debates of Astronomy: The Scale of the Universe

The Scale of the Universe What the Great Debate was, how it was resolved, and why it was important. A subjective abstract in three short paragraphs.

  • Great Debate of 1920 centered on scale of Universe between Shapley and Curtis
  • Shapley argued Sun far from Galaxy center, Curtis claimed spiral nebulae were separate galaxies
  • Hubble's 1920s discovery proved Andromeda Galaxy vast, disproving both Shapley and Curtis

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