Mars honeycomb mystery deepens as Curiosity spots sea of polygons
NASA's Curiosity rover has found a field of honeycomb-like polygons in the Martian valley Valle Grande. The polygons measure about 1.3 to 3 inches across, and scientists still don’t know how they formed; potential explanations include ancient wet-dry cycles or sediment processes, and researchers hope the data will reveal clues about Mars’ past climate and geology.