text: My last reason for why this is not an alien made monument is because there is no proof that aliens made it. For example, have aliens been proven to exist. No proof was every made that aliens exist in the planet mars. Secondly, how could they build such a thing. if aliens built it than there must be a great amount of them that we did not know about. Lastly, if aliens aready built a Face on Mars why can't they do the same thing on Earth. there is no explanation of they wouldn't be able to do this. In order for the aliens to make something like this that would mean they are capable of this and more but they still haven't been proven to exist.