In the Great Debate of 1920, Curtis argued that spiral nebulae were individual galaxies, while Shapley argued spiral nebulae must be part of the Milky Way because the Milky Way was very large in size.

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This is true. The debate between Curtis and Shapley was a significant moment in the history of astronomy, and it ultimately led to the acceptance of the idea that there are many galaxies beyond our own Milky Way. Curtis used observations of spiral nebulae to argue that they were independent galaxies, while Shapley believed that they were part of the Milky Way because of the apparent size of our galaxy.

In the Great Debate of 1920, Curtis Argued That Spiral