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The Conversation USA

One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate’

  • Written by Chris Impey, University Distinguished Professor of Astronomy, University of Arizona
imageThe Andromeda galaxy helped Edwin Hubble settle a great debate in astronomy. Stocktrek Images via Getty Images

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his colleagues on his behalf reported that the...

Read more: One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled...

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