text: They used the cameras highest resolution. Each pixel in the 2001 image spans at 1.56 meters, compared to 43 meters per pixel in the best 1976 Vikings photo."As a rule of thumb, you can discern things in a digital image three times bigger than the pixel size. So if there were objects on the ground such as airplanes or Egyptian-style pyramids or even small shacks, you could have seen what they were" Said Jim Garvin.