Was there water on Mars? Could it have supported life? For centuries, people have speculated about such questions. Since the beginning of this year, though, when two unmanned rovers, Spirit and Opportunity , landed on the red planet, real answers have begun to appear based on the streams of data that the robots have been beaming back to earth. This month Spirit and Opportunity found evidence of Martian water in layers of volcanic rock.
March 10th, 2004