What was the prevailing ancient understanding of the Moon's nature before Galileo's observations?

Answer

It was supposed to be a beacon of ethereal smoothness, perfect and unchanging.

The ancient view, rooted in Aristotelian philosophy, held that celestial bodies were perfect, unchanging, and fundamentally different from the messy Earth, meaning the Moon was considered a flawless orb.

What was the prevailing ancient understanding of the Moon's nature before Galileo's observations?
discoveryGalileoastronomytelescopeMoon