Why does the universe being so big, increase the odds for more life? Couldn't life just be so complex, that it takes an entire universe to get all the variables juuust right for life?
If we don't even know how big the universe is, or what truly defines "life," how can you make an assumption about the concentration of life across the universe? As in, who is to say if Earth is the only source of life, that the universe isn't overpopulated as is?