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Astronomy and space

Astronomy and space

Shapley, Curtis and the ‘island universes’ controversy

26 Feb 2021
This article is taken from the February 2021 issue of Physics World.

Logan Chipkin looks at what lessons we can learn from the 1920 “Great Debate” between Harlow Shapley and Heber Curtis about the scale of the universe

Andromeda galaxy
(CC BY 2.0 Adam Evans)
“The Shapley–Curtis debate makes interesting reading, even today. It is important not only as a

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Logan Chipkin is a freelance writer based in Philadelphia, US,
e-mail chipkin.logan@gmail.com, Twitter @ChipkinLogan
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