There’s been quite a bit of speculation regarding alternative biochemistries; however, most of the popular ones seem to have various problems (most often low elemental abundance and inconvenient chemical properties). It’s of course difficult to prove that all of them are impossible in a search space the size of the universe, though.
There’s been quite a bit of speculation regarding alternative biochemistries; however, most of the popular ones seem to have various problems (most often low elemental abundance and inconvenient chemical properties). It’s of course difficult to prove that all of them are impossible in a search space the size of the universe, though.