@Numpty,
To say the life does not exist elsewhere because we have not yet found it, is the equivalent of looking outside your window, seeing no one, and concluding you are the only person on the planet.
the universe is so expansive it is a bit ridiculous to expect to find life so close to earth.
I don't think we will ever find intelligent life but i do think we will find life (even if microscopic) elsewhere within my lifetime.