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Galaxies Question

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canyouhelp? | 15:56 Thu 03rd Jan 2019 | Quizzes & Puzzles
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Who first argued that galaxies were 'island universes' in the Great Debate of 1920? A. Heber Curtis B. Edwin Hubble C. Harlow Shapley
I can find reference to both Curtis and Shapley. Thanks for any help with this one.
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//Curtis on the other side contended that Andromeda and other such "nebulae" were separate galaxies, or "island universes" (a term invented by the 18th-century philosopher Immanuel Kant, //
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Thank you both - looks like Curtis is the correct answer

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