The science team thinks that igneous and/or metamorphic processes likely formed the rock.
The hidden Mars structures are mysterious because they appear to be significantly denser than their surroundings.
Among several recent findings, the rover has found rocks made of pure sulfur — a first on the Red Planet.
NASA's Mars Reconnaissance Orbiter (MRO) has discovered another intriguing formation on the planet's barren surface. Despite their best efforts, scientists can only guess as to how exactly holes like this one were formed.
These so called "spiders" are the result of a complex geological process that causes carbon dioxide to sublimate, digging up darker material from below the surface during the planet's spring.
A team of scientists have found that a single meteorite was likely responsible for creating billions of craters on the Martian surface.
China's Zhurong rover, equipped with a ground-penetrating radar system, identified irregular polygonal wedges located at a depth of about 35 meters all along the robot's journey.
Three to four billion years ago, Mars did in fact have running rivers of water. Now, scientists have mapped out an entire ancient river system.
The ESA recently released stunning photos of a Martian storm front, which were acquired by the Mars Express orbiter in April of 2018.
A storm of tiny dust particles on Mars has prompted NASA's Opportunity rover to suspend science operations. The Martian dust storm has grown in size and is now officially a 'planet-encircling' (or 'global') dust event.