Mars Rovers Explore Possibility of Acidic Steam

As Spirit makes its way to a wintering spot, scientists are trying to make sense of a patch of nearly pure silica the rover found. The silica was so concentrated scientists believe steam must have been involved in ways similar to geologic formations seen on Earth called fumaroles which are seen in places like Hawaii and Iceland but are different from the mineral deposits seen in hot springs. While several possibilities exist for the formation of the silica patch, the presence of titanium is indicative of fumarole-type formation. Researchers are using both rovers now to look for signs of similar patches, with hope that a find by Opportunity, on the other side of the planet, will provide more general evidence for the role of water in the planet's past. The article can be found here: http://www.sciencedaily.com/releases/2007/12/071212000742.htm