text: Secondly, no one has any proof that it could be an alien or a human. For instance, the text states," Scientists figured it was just another Martian mesa." This piece of evidence shows that they can't figure out exactly what the face is. They are making aussumtions of what the face might be, but they aren't one-hundred percent sure of what it is. NASA would have to have proof to say it is an alien or not.