NASA's Curiosity rover imaged a vast field of polygonal fractures across Valle Grande in a 360° panorama on June 19–20. The honeycomb-like patterns, which also surround the 20-foot Miraflores butte, could result from dried mud, thermal cycling, or compression after burial. Scientists are analyzing the shapes and chemistry to learn what the polygons reveal about ancient water and Mars' potential habitability. The finding adds to Curiosity's long record of discoveries while informing models of planetary climate and erosion.
Curiosity Images Vast Honeycomb of Polygonal Cracks on Mars — New Clues to Ancient Water
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NASA's Curiosity rover has returned one of its most striking views of Mars: an expansive valley floor in Valle Grande that appears tiled with giant, honeycomb-like polygonal fractures stretching toward the horizon.
A 360-degree panorama captured by Curiosity on June 19–20 shows the patterned polygons blanketing the landscape in every direction visible to the rover. The same geometric pattern also rings the nearby Miraflores butte, a roughly 20-foot-high feature capped by a thick sand layer.
Ashwin Vasavada, Curiosity project scientist at NASA's Jet Propulsion Laboratory, said: "We've seen a lot of fascinating landscapes through Curiosity's eyes, but this sea of polygons took our breath away."
Scientists have not yet settled on a single origin for these formations. Leading hypotheses include dried and cracked mud from ancient wet conditions, repeated thermal cycling of the surface (alternating warm and cold conditions), or compression after burial that could have squeezed water out of sediment layers. Researchers are combining detailed shape measurements, contextual geology, and chemical analyses to narrow which scenario — or combination of scenarios — best explains the features.
Why This Matters
Understanding how water shaped Mars helps scientists evaluate whether the planet once had the right combination of water, chemistry and nutrients to support microbial life. The new polygonal field is another piece of evidence that helps reconstruct ancient environments and refine models of climate, erosion and soil evolution on Mars.
Curiosity's long mission has already revealed sulfur crystals, meteorites, and chemical signatures tied to a wetter past, along with carbon-based compounds that are considered potential precursors to RNA and DNA. Since 2014, the rover has been climbing the lower slopes of Mount Sharp, reading layered rocks that record the planet's environmental history.
Earth Benefits and Next Steps
Beyond pure science, technologies developed for Martian missions — including autonomous navigation, durable robotics, compact sensors and advanced imaging — have practical Earth applications in infrastructure inspection, disaster response and remote environmental monitoring. These tools can reduce risk for workers and speed up field operations.
NASA scientists are continuing to analyze the polygons' morphologies and chemistry to determine how they formed and what they reveal about Mars' ancient water history. Future work will combine imagery, in-situ chemical data and regional geology to test formation models and place the discovery in the broader context of Curiosity's findings.
Context: Curiosity landed in Gale Crater in 2012 and has contributed a growing catalogue of discoveries that deepen our understanding of Mars' past habitability.
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