A delicate rock formation resembling coral has been spotted on Mars, according to images sent back by NASA’s Curiosity rover. Although it mimics the branching shape of coral seen in Earth’s oceans, scientists confirmed the structure is the result of natural geological processes unique to the Martian environment.
The unusual rock was discovered on July 24 inside Gale Crater, the expansive basin that Curiosity has been exploring since 2012. The object, about 1 inch (2.5 centimeters) wide, stands out due to its intricate, coral-like form.
NASA released the image on August 4, captured using the rover’s Remote Micro Imager—a high-resolution camera mounted on the end of Curiosity’s robotic arm.
Wind and water helped shape Martian rock into branching forms
NASA researchers explained that the structure, while visually similar to coral, formed over billions of years through a combination of ancient water activity and long-term erosion by Martian winds. These forces shaped the rock’s branching appearance, which is now exposed on the surface.
BREAKING 🚨: Curiosity rover spots 'Coral reef' rock on Mars. it’s a sign of ancient water! pic.twitter.com/T1AAHP0wIi
— Shining Science (@ShiningScience) August 8, 2025
The mission scientists explained that these formations likely began during a time when Mars still had liquid water on its surface. That water, carrying dissolved minerals, moved through tiny cracks in the rocks.
Over time, minerals settled and hardened into narrow veins within the rock. As wind-driven sand slowly wore down the surrounding material, only the hardened mineral veins remained, revealing the coral-like shapes seen in the rover’s images.
Curiosity has found similar formations in Gale Crater
NASA stated that Curiosity has identified multiple similar features throughout its mission. One example is “Paposo,” another oddly shaped rock about 2 inches (5 centimeters) across, found on the same day in Gale Crater. In 2022, the rover also photographed a flower-shaped formation in the same region.
Curiosity’s mission, led by NASA’s Jet Propulsion Laboratory in California, aims to study Mars’ surface for signs of past habitability.
The rover touched down in Gale Crater, located between the planet’s southern highlands and northern plains, and has since traveled about 22 miles (35 kilometers) across the 96-mile-wide (154 km) area. Its path is slow and deliberate, with frequent stops to drill into rocks, collect samples, and study the terrain.
The coral-like structure adds to a growing body of evidence suggesting Mars once hosted the conditions necessary for life. Among the most notable findings are carbon-rich molecules from rocks dating back 3.7 billion years and chemical signatures indicating the presence of a past carbon cycle.
While no direct signs of life have been confirmed, the discovery of formations like this continues to deepen scientific understanding of the Red Planet’s complex and ancient geological history.
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