>>17864521im not even christian and i know what that anon is talking about
The first argument is that God’s power is infinite, or in theological terms, that God is omnipotent. Therefore, if God could create one world, he could create multiple worlds. There is therefore no reason why there are not multiple ‘Earths’ in the universe. Although we live in a much more secular age than that experienced by Aquinas, this line of thought sometimes still appears in those with religious leanings who believe in life beyond Earth.
The second argument presented is that of quantity: life on Earth is inherently good, and so because God is good, it stands to reason that God would create multiple worlds as opposed to just one, to multiply the goodness. The nature of goodness is, after all, to spread goodness: as we say in our day, ‘sharing is caring’; or in the words of Jesus, ‘no one hides a lamp under a basket’.
The third argument is arguably the most abstract, but it basically states that because the world is made of matter, there is nothing stopping multiple worlds from existing, just as there is nothing stopping multiple men from existing.