What substance was the Moon traditionally believed to be made of centuries before Galileo?

Answer

Pure, smooth, ethereal substance

For centuries leading up to Galileo's work, scholars believed the heavens, and specifically the Moon, consisted of a flawless, pure, and ethereal material, contrasting sharply with the Earth.

What substance was the Moon traditionally believed to be made of centuries before Galileo?

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Galileo's Revolutionary Observation - YouTube

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