Galileo's discovery that the Moon shared rugged geography with Earth challenged which established cosmological division?
Answer
The separation between the celestial realm and the sublunary world
The ancient Greek view separated the cosmos into the perfect, unchanging celestial realm (aether) and the changeable, imperfect sublunary world (Earth's surroundings). Showing the Moon was imperfect linked the heavens and Earth, undermining this separation.
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