
Face on Mars : is a theory of a face on mars, constructed by some unknown civilisation. This idea has been a subject of debate and wonder for almost 25 years. In 1976 the Viking Orbiter sent back an image from the Cydonia region of Mars.
Some scientists were intrigued by a certain formation that seemed to strongly resemble a human face. However because the red planet had such a vast array of features to be examined "The Face on Mars" was largely accepted by most scientists as a trick of the light or merely wishful thinking. There was no direct evidence to suggest that sentient beings had existed on Mars, hence no real reason to think that the "Face" was anything more that a natural formation.