Ever since the world learned about the Red Planet, people were fascinated about visiting it one day. People couldn’t stop wondering how Mars looks, if there are green aliens, or the area is empty. Are there colonies of weird-looking humans? Are there remains of lost civilizations? Now, that we’ve sent rovers to the surface, what we’ve found has posed more questions than answers.

Sure, satellite images have led for years to funny speculation by both amateurs and experts, but that wasn’t valid enough. Still, some appearances are so unusual that not even NASA couldn’t explain them. These strange discoveries humankind has made on the surface of the Red Planet have us realizing that we know so much less about space than we thought. Read on to see the most usual images on Mars that people can’t fully explain.