Rocky polygons on Mars

The picture shows part of a region on Mars dotted with narrow mountain ranges. Some of these ridges are comparable in height with a 16-storey building. A notable feature of this area is that these mountain structures intersect at angles and almost form the polygons.

Thin, blade-like walls of these mountain ranges dominate the previously unknown network of intersecting ridges on Mars. Scientists have discovered these amazing rocky structures in images of the Martian Reconnaissance Vehicle (NASA).

The simplest explanation of these spectacular ridges is that the lava flowed into pre-existing fractures and was more resistant to erosion compared to the surrounding material.