What was the prevailing ancient philosophical view regarding the substance comprising the celestial heavens before the late 16th century?

Answer

It was made of an incorruptible substance.

Ancient doctrine, heavily influenced by Aristotle, held that the heavens were perfect and immutable, distinct from the corruptible Earth, consisting of an incorruptible material.

What was the prevailing ancient philosophical view regarding the substance comprising the celestial heavens before the late 16th century?

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