What was the primary composition suggested for the Milky Way by thinkers influenced by classical thought before Galileo's observations?

Answer

Celestial vapor, fire, or unresolved distant stars

Pre-Galilean cosmological models often categorized the diffuse streak as a phenomenon distinct from individual stars, sometimes considering it vapor or fire, or as unresolved stars too distant to see clearly, as suggested by Aristotle.

What was the primary composition suggested for the Milky Way by thinkers influenced by classical thought before Galileo's observations?
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