text: Mission controllers prepared to look again. Mars Global Surveyor is a mapping spacecraft that normally looks straight down and scans the plant like a fax machine. Thousand of anxious web surfers were waiting when the image first appeared on a JPL web site. The pictures were revealing a natural landform. Each pixel in the 2001 image spans 1.56 meters, com[ared to 43 meters per pixel in the best 1976 viking photo.