It was aliens.
Who put the miles high monolith on the Martian potato shaped moon, Phobos? Since Mankind is likely to have done so, it would be aliens, right? And after you do a search on that anomaly, you can start doing searches on ‘faces on Mars’ ... there’s more than one, and some sort of gigantic ‘lettering’, also. And yes, the data are straight from NASA photographic images.