To clear things up about the title, scientists currently believe that life will only exist on planets with Earth like atmospheres, be carbon based, and be dependent on water. I propose a form of life that would be silicon-based, rely on mercury (the same way we rely on water), and potentially even breath methane. There really isn't anything holding this form of life from existing, but according to Humans, it isn't life! Anyone care to explain if this is actually true, as most of this is just my amateur speculation?