You know smartest people of your time and preview have said that mathematically it's impossible for there to be life only on earth. The question of course always is where is it then? The space is too big for such answer, as well as it might not be in our galaxy or even our dimension. Life is likely to be in other plants like 2 plus 2 equals 4. However in other dimension such math problem can have a different answer. Perhaps such question about life too?