In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...
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One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate’Some were gaseous, star-forming regions, such as the Orion nebula, or M42 – the 42nd ... could be enormous stellar systems outside the Milky Way – but astronomers now just call these systems ...
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