"Phobos - Mars Express" by jccwrt is licensed under CC BY-SA 2.0
How the large monolith-like structure on Mars’ moon, Phobos, was formed has led to many different theories, but perhaps nobody will ever know the truth.
Phobos
In 2009, first man on the moon Buzz Aldrin said on C-SPAN regarding the large monolith-like structure on Mars’ moon, Phobos, that “When people find out about that they are going to say, ‘Who put that there? Who put that there?'” And he was right! Today, many people question the true origin of the strange rock formation, some claiming aliens, God, or just plain asteroid impact or simple erosion.
Some of the more interesting theories, including Scott Waring’s, is that it was built by some form of aliens, and that NASA is actively suppressing information leading to the wider public’s knowledge of extraterrestrials.
However, the most probable, and simplest explanation is that it is simply a rare shard of the moon’s bedrock poking out to the surface, or just remnants of an asteroid. Or, it could be that the moon is just falling apart, like NASA suggested in 2015.
Possibilities of a mission to Phobos, and Mars, could clear up a lot of confusion and speculation about the strange occurrences on planets. But we’ll just have to wait and see.