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Aquinas, Thomas (1225–1274)

Thomas Aquinas was a leading Italian scholastic theologian who defended the teachings of Aristotle and argued against pluralism. He reasoned that if there were many inhabited worlds they would either have to be different, in which case they could not all be perfect (thus casting doubt on God's own perfection), or identical, which (considered from God's point of view) would be pointless.

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   • medieval philosophy, related to the possibility of extraterrestrial life

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