This great science story hit the press yesterday. It seems scientist have some proof of liquid water flowing recently on the surface of Mars.
"Water seems to have flowed on the surface of today's Mars," said Michael Meyer, lead scientist for NASA's Mars Exploration Program, speaking at a news conference yesterday. "The big question is how does it happen, and does it point to a habitat for life?"
Source: Mars Photos May Indicate The Recent Flow of Water - washingtonpost.com
Of course, this could mean that life may exist on Mars. I've always been fascinated by the scientific problems this would pose. How does one explain the emergence of life on Mars? Did it evolve via the primordial sea as in theorized here on earth, or was there an entirely different process? I am also thrilled at the possibility that earth is not unique. If life exists on Mars, it could exist throughout the universe.