text: Aliens could not have made the face becasue they do not exist. This is why NASA thinks this. Aliens would have to have good construction and excavtion equipment. As you would say, they don't need that stuff they just built it. However, there is no physicaly possible way that they could have made it without the equipment. In order to build they would need this equipment. All together aliens could not have made this because they are not capable and do not exist.