What was the prevailing view of the Moon's composition before Galileo's telescopic observations?

Answer

A perfect, smooth orb made of a flawless substance called aether.

The established Aristotelian and Church-supported cosmology described the heavens, including the Moon, as being composed of perfect, unchanging spheres made of aether, implying flawless smoothness.

What was the prevailing view of the Moon's composition before Galileo's telescopic observations?
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