Statistical impossibility??

First off I am new at this fourm and all fourms for that matter. I have a possible topic. I have no source or data to back what I am going to state but here goes anyway. I have heard that some physicists have stated that it would be statisticaly impossible for all the factors that go into making a place in the universe suitable for life (as we know it) to come about given that there is only one universe. I have also heard that to get around the staggering statistics people have stated that there are many Universes that we just don't know about. I open the floor for anyone that can bring any intelligence into this topic, I know I have not said anything intelligent.