It seems the more that is discovered the more it is realized the rarity of the many conditions for advanced life (including heavy metals and other elements in ‘just right’ proportions) are only satisfied on the earth, variously referred to as the anthropic principle or the Goldilocks zone (both including fine-tuning parameters). Books have been written about it, and by non-Christians (Rare Earth: Why Complex Life is Uncommon in the Universe is one from a while back). Given what we know about why God created in the first place, it would not surprise me if we are it, at least with respect to sapient life. (I would not be devastated if we weren’t.)