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The Mars monolith is a rectangular object, possibly a boulder, discovered on the surface of Mars.[1][2] The Mars Reconnaissance Orbiter took pictures of it from orbit, roughly 180 miles (300 km) away.[1] The HiRISE camera that was used to photograph the monolith has a resolution of approximately 1 foot or 30 centimeters per pixel.[3]
Around the same time, the Phobos monolith made international news.[4]