Are we alone

As the world awaits the Mars landing tomorrow the question about intelligent life in the universe in on the minds of some. There is no direct evidence of intelligent life but there is almost a mathematical certainty that there is. There are 40 billion earth like planets in our galaxy and there are 100 billion galaxies so there are 4,000 billion billion possibilities. An earth like planet is one that can have liquid water. To add to that there is theoretical evidence that there are multiple universes.