The Brief NASA's Curiosity rover discovered the largest honeycomb-like rock fracture field ever seen on Mars, offering a potentially important clue to the planet's geologic history and ancient environment. The discovery adds to Curiosity's long list of findings, including sulfur crystals, organic molecules and evidence of ancient water. NASA's Curiosity Mars rover has uncovered an unexplained discovery – the largest field of honeycomb-like rock fractures seen during its mission on Mars. NASA Mars rover spots ‘honeycomb’ patterns on planetBig picture view:As NASA’s Curiosity rover recently began climbing up a Martian valley nicknamed "Valle Grande," it sent back images that were a familiar sight to mission scientists: honeycomb-like textures called polygonal fractures, each one about 1.5 to 3 inches across. A close-up of the polygon fractures discovered by NASA’s Curiosity Mars rover highlights their honeycomb-like textures(Credit: NASA/JPL-Caltech/MSSS)Scientists believe some similar formations previously observed by Curiosity were created as mud cracks formed when wet sediment dried.