Mapman, take a deep breath. People have been getting all worked up about the possibility of life on Mars for, what, 200 years? Not very much different than speculating about UFOs and the possibility of life on other worlds. For the most part it's the stuff dreams and science fiction (e.g., the recent movie Prometheus) are made of. Not that's there's anything wrong with dreams, or science fiction, or wondering where we came from or What it All Means. By most accounts, including NASA, Mars is simply too small to have much of an atmosphere of any kind, and the one it does have is primarily carbon dioxide. Mars has much more in common with our Moon than Earth. Not a very promising scenario IMO for supporting life other than perhaps bacteria.