"There is a strange door-like structure at the base of the mountain formation from a NASA image of Mars that is causing a stir. The first person to notice it wasn’t a NASA scientist, however, but rather a Russian reader of the portal R&D.Cnews, Alexander Novgorodov. Taking a closer look at an image taken by the spacecraft Mars Reconnaissance Orbiter, he noticed an unusual morphology, which looks strikingly like a manmade doorway.
Of course, the object’s intriguing form does not denote the presence of a real doorway, nor would it imply that the mountain formation is of artificial origin. That would make an incredible story indeed, but the likely cause it boring old weather erosion. However, the peculiarities are of interest due to their unique morphology.
The unusual teardrop mountain formation, which likely resulted from some sort of weathering, is located amid Mar’s frozen ocean region.
A planet of extremes, Mars is home to the largest mountain in the solar system, the largest canyon in the solar system and intensely severe dust storms. It is also home to the only other likely option for humans to live within our Solar System. (...)"
Full article: Dailygalaxy.com