Mars rock food for thought The Scotsman

NASA scientists are baffled by new microscopic photographs of a Martian rock taken by the United States space agency Opportunity rover. The images, which have been posted on a NASA website, show the highly detailed surface of a rock dubbed El Capitan that has been undergoing examination by the robot geologist. However, unlike its towering namesake in Yosemite National Park in California, the rock is probably about as high as a street curb.