I shall be shocked if we do not find life on Mars. There have been landings on Mars and devices exploring it from China, America, Russia, United Arab Emirates and Europe. Japan has yet to achieve a soft landing. It is difficult to get there and achieve a soft landing. Half of the American attempts have been total failures. On their current effort the American craft will land and explore with a tiny helicopter, which will have to be very good technology because there is no air for it to use to stay aloft.

But it may well be that the life that is found there is that which we took there.

This is the view of Professor Paul Davies, an English bloke. His research interests are in the fields of cosmology, quantum field theory and astrobiology at Arizona State University. "I’m afraid humans have been contaminating Mars with terrestrial organisms for decades. NASA long ago gave up attempting to fully sterilize their Mars probes".