Curiosity has found a vast sea of Martian polygons that may reveal how water and climate once reshaped the Red Planet. NASA’s Curiosity rover has encountered an enormous field of honeycomb-shaped fractures while climbing through a Martian valley known as “Valle Grande.” Curiosity has seen smaller groups of similar formations before, but mission scientists have never observed them covering such a broad area. More importantly, Curiosity has uncovered strong evidence that ancient Mars once contained the water, chemical ingredients, and nutrients needed to support microbial life. JPL leads the mission for NASA’s Science Mission Directorate in Washington as part of the agency’s Mars Exploration Program portfolio.