NASA's Curiosity Rover Finds Vast 'Sea of Polygons' in Martian Valley
A massive field of honeycomb-shaped fractures in Gale Crater offers new insights into the geological evolution of ancient Mars.
NASA's Curiosity rover has discovered a massive expanse of honeycomb-shaped polygonal fractures in the Valle Grande region of Gale Crater. The find marks a significant shift in the mission's geological observations, moving from sporadic sightings of such textures to the discovery of a vast, continuous field.
Captured via a 360-degree panorama on June 19 and 20, 2026, the images reveal fractures measuring approximately 1.5 to 3 inches (4–8 cm) wide. These patterns stretch across the valley floor, surrounding a 20-foot (6-meter) tall sand-capped butte that the mission team has nicknamed 'Miraflores.' Ashwin Vasavada, a Curiosity mission project scientist at NASA’s Jet Propulsion Laboratory, noted the scale of the discovery: "We’ve seen a lot of fascinating landscapes through Curiosity’s eyes, but this sea of polygons took our breath away."
Curiosity has been exploring Gale Crater since 2012 to determine if Mars ever supported microbial life. Over the last decade, the rover has identified organic molecules and gathered extensive evidence that ancient Mars was once wetter and more hospitable. As the rover continues its ascent through the valley, mapping these surface textures helps scientists reconstruct the planet's environmental history.
The transition from small, isolated patches of polygons to a "sea" of them transforms the area into a mappable geological province. For planetary scientists, the origin of these shapes is critical. Such textures typically form through thermal cycles of extreme heating and cooling or through the compression of water out of sediment. Determining which process created the Valle Grande polygons will provide direct evidence regarding Mars' ancient water activity and the mineral changes that occurred over millions of years.
NASA researchers are now working to determine the exact composition and formation mechanism of the fractures. While the visual evidence is unprecedented in scale, the specific geological process—whether thermal or sedimentary—remains the primary focus for the mission's next phase of analysis in the region.