Mars Rover Finds Strange Honeycomb Patterns on Red Planet

NASA News 29 Jul 2026 2 min read

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NASA's Curiosity rover discovered an unprecedented expanse of honeycomb-like polygonal fractures, each 1.5 to 3 inches across, covering the terrain in a Martian valley called Valle Grande. While the rover has encountered small patches of these geometric patterns before, this represents the largest concentration observed in the mission's 14-year history. Scientists are analyzing the shapes and chemistry to determine their formation mechanism, which could involve ancient mud cracks, temperature cycles, or sediment compression processes.

Why it matters

This discovery adds to the growing body of evidence about Mars' ancient watery environment and the geological processes that shaped its surface. Understanding these formations helps scientists reconstruct the planet's climatic history and assess whether conditions were suitable for supporting microbial life billions of years ago.

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A panoramic view of a sweeping Martian plain covered in patterned fractures leading toward distant hills showcases the terrain explored by NASA's Curiosity rover to investigate the planet's past environment.

NASA’s Curiosity rover discovered an expanse of terrain covered in surface features called polygons. Scientists have never seen so many of these features in one place and are unsure how they formed.

NASA/JPL-Caltech/MSSS

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 (4 to 8 centimeters) across. The mission has spotted small patches of these geometric shapes several times before, but nothing at the scale discovered in Valle Grande.

In a 360-degree panorama that the rover captured on June 19 and 20, the 4,930th and 4,931st Martian days, or sols, of the mission, the polygonal shapes spread in all directions for as far as the rover can see. They even wrap around the sides of a nearby butte nicknamed “Miraflores,” which stands 20 feet (6 meters) tall and is topped with a thick cap of sand.

“We’ve seen a lot of fascinating landscapes through Curiosity’s eyes, but this sea of polygons took our breath away,” said the mission’s project scientist, Ashwin Vasavada of NASA’s Jet Propulsion Laboratory in Southern California. “We measured their shapes and chemistry carefully and are hopeful there are clues in the data as to how these features formed.”

NASA’s Curiosity rover captures a rocky, reddish Martian landscape filled with polygonal fractures.

A close-up of the polygon fractures discovered by NASA’s Curiosity Mars rover highlights their honeycomb-like textures

NASA/JPL-Caltech/MSSS

Some of the polygons that the mission has spotted in the past clearly formed as mud cracks, though a variety of processes can contribute to their honeycomb textures, including cycles of warm and cold temperatures or compression that squeezed water out of the sediment when the surface was buried.

These newly discovered polygons are among the many surprises Curiosity has trundled across since landing on Mars 14 years ago, on Aug. 5, 2012. Besides sulfur crystals, shiny meteorites, and other interesting geologic features, the rover has made major discoveries about the ancient Martian environment — most importantly, that it had the water, chemistry, and nutrients to support microbial life.

Billions of years ago, lakes and streams dappled the lower foothills of Mount Sharp, a 3-mile-tall (5-kilometer-tall) mountain that Curiosity has been ascending since 2014. The rover has previously uncovered chemistry left over from Mars’ watery history, including carbon-based molecules believed to be precursors to RNA and DNA, two nucleic acids that carry genetic information. Scientists have no way of knowing whether these organic molecules were created by biologic or geologic processes — either path is possible — but their discovery reconfirmed that ancient Mars had the right chemistry to support life.

NASA’s Curiosity Mars rover captured this sand-capped butte, nicknamed “Miraflores,” estimated to be about 20 feet (6 meters) tall, on June 11, 2026. The surrounding area includes an expanse of terrain covered in surface features called polygons.

NASA/JPL-Caltech/MSSS

Managed by Caltech in Pasadena, JPL built Curiosity and leads the mission on behalf of NASA’s Science Mission Directorate in Washington as part of the agency’s Mars Exploration Program portfolio.

To learn more about Curiosity, visit:

https://science.nasa.gov/mission/msl-curiosity

News Media Contacts

Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433
andrew.c.good@jpl.nasa.gov

Karen Fox / Alana Johnson
NASA Headquarters, Washington
240-285-5155 / 202-672-4780
karen.c.fox@nasa.gov / alana.r.johnson@nasa.gov

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