What was the central question astronomers sought to resolve during the period famously known as the "Great Debate"?

Answer

Whether spiral nebulae were nearby gas clouds or distant independent star systems

The Great Debate centered on whether the observed spiral nebulae were relatively close stellar nurseries situated within the Milky Way or if they were, in fact, incredibly distant, self-contained stellar systems existing outside our galaxy.

What was the central question astronomers sought to resolve during the period famously known as the "Great Debate"?
galaxyAstronomeruniverseLawcosmology