this is probably one of the most famous space images of all time. the face on mars - used first to actively encourage interest in nasa's interplanetory exploration ambitions. then to quell it (when further 'analysis' declared it a natural phenomomyn and not 'face like' at all) when the political agenda changed. it was taken in 1976 by the viking orbiter in the region known as cydonia, at latitude 40° north. it's size, as best they could judge it, was roughly 2.5 km (1.6 miles) long, 2 km (1.2 miles) wide and up to 940 m (2,600 ft. high).
there were two other images taken, so they claimed of the same area, one in 1998 and later in 2001. to put it simply, i don't believe they are the same face. i also believe that the subsequent images were doctored to make them appear similar. firstly look carefully at the first image. the drop from the jaw to the mars surface is steep and pronounced. the second - the 1998 image shows a clear shelf or ledge. the third is different again. and for a mere 3yrs difference there seems to be marked erosion for them to be of the same monument. BUT both the 1998 and 2001 images DO SHOW DEFINITE LAYERS IN THEIR CONSTRUCTION!! just in different places when you look over the brow. and it seems, despite the advancements in technology, they couldn't manage to get the focus right on the background/surface.
in the 1976 image you also clearly see bumps over the top of the head and a rather distinct mouth. on the 1998 one there seems to be a cleft palate?... and they want us to believe these are all of the same 'landform'.
now a little playing around with the 2001 photo -
okay, so i did a little creative editing myself. but then, nasa did it first.