Honestly, we just don’t know. Apparently the basis of most of our belief in the lack of life on Mars might be bad data. The Viking Mars Mission from 30 years ago flew close enough to Mars to see if it could remotely detect signs of life. Apparently scientists have reproduced the technology the Viking mission used and tested it in remote regions of Earth. Their findings show that Viking wouldn’t have found life on Earth using the technology it employs in similar climate regions when clearly there is life on Earth in those regions. Does that mean there is life on Mars? Nope, not necessarily. All we can say is that the Viking Mission employed techniques that wouldn’t have found signs if there were any life on Mars. Hopefully the 2009 mission will help decide once and for all this age old question.