The Mars rover Spirit has uncovered the strongest evidence yet that ancient Mars was wetter than previously thought, scientists reported Monday. The robot analyzed a patch of soil in Gusev Crater and found it was unusually rich in silica. Scientists said the presence of water was necessary to produce such a large silica deposit. "This is a remarkable discovery," principal investigator Steve Squyres of Cornell University said in a statement. "It makes you wonder what else is still out there." Spirit previously found clues of ancient water in the crater through the presence of sulfur-rich soil, water-altered minerals and explosive volcanism. But the latest find is compelling because of the high silica content, researchers said, raising the possibility that conditions may have been favorable for the emergence of primitive life.