text: The credibility of the Mars Global Surveyor has been tested twice on the Face. It took its first picture of the Face in 1998. Sceptics blamed the weather for covering up "hidden alien signs." Three years later, the Mars Global Surveyor took another picture of the Face. This picture was taken with optimul weather conditions and on the highest resolution possible for that camera. The clearity showed that the Face of Mars was mearly an amazing landform, not an alien artifact.