text: As stated before, the picture resolution increases with each attempt at an image, and still no alien civilization! The article states "Each pixel in the 2001 image spans 1.56 meters, compared to 43 meters per pixel in the best 1976 Viking photo." If there was above-ground alien civilization, we would have seen it by these pictures. The logical conclusion for the illogical is "What if they are underground?" and this is a valid point until you look at it more closely. To "sculpt" this landform, the aliens would have to dig out surrounding land, and that is hard, not impossible, but hard to do. And as stated before, use Occam's Razor. Also, they would most likely have to have some way to see humans, because the chances of aliens on a different planet in a different environment evolving similar faces to ours seems a little far-fetched. They would have some sort of visible, surface-bound satillite dish or something similar to recieve the signal.