What fundamental characteristic of the Moon did Galileo document that contradicted centuries of Aristotelian thought?

Answer

It had a rough and uneven surface covered in mountains and craters

Galileo observed that the Moon was not the perfect, smooth sphere described in classical philosophy, but instead showed features like mountains and craters revealed by shadows, indicating the heavens were not made of an unchanging, perfect substance.

What fundamental characteristic of the Moon did Galileo document that contradicted centuries of Aristotelian thought?

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