NASA’s Curiosity rover has identified the most diverse array of organic molecules ever detected on Mars, offering new insight into the planet’s chemical history and its potential to support life.

Axar.az reports that the findings come from a rock sample known as “Mary Anning 3,” collected in Gale Crater, where ancient lakes and streams once existed billions of years ago. Scientists confirmed the presence of more than 20 organic molecules, including several never before observed on the Martian surface.

Breakthrough in Martian Chemistry

The discovery was made using Curiosity’s onboard laboratory, Sample Analysis at Mars (SAM), which conducted a specialized wet chemistry experiment using a reagent known as tetramethylammonium hydroxide (TMAH). This method allowed researchers to break down complex materials and release previously undetectable organic compounds.

Among the identified molecules are aromatic and cyclic compounds such as benzothiophene, methyl benzoate, and naphthalene. Notably, benzothiophene—a sulfur-containing molecule commonly found in meteorites—was confirmed on Mars for the first time.

Scientists also detected structures that may include nitrogen-bearing compounds, potentially resembling early chemical precursors to biologically relevant molecules.

Ancient Origins, Uncertain Pathways

While the presence of organic molecules is a key ingredient for life, researchers caution that these compounds can form through both biological and non-biological processes. The origin of the detected molecules—whether from ancient Martian chemistry or external sources like meteorites—remains unclear.

However, the findings reinforce the idea that Mars once had conditions suitable for preserving complex organic chemistry over billions of years, despite harsh radiation and environmental exposure.

Preserved in Clay-Rich Rocks

The sample was extracted from clay-bearing sedimentary rock in a region believed to have been shaped by water activity around 3.5 billion years ago. Clay minerals are known for their ability to trap and preserve organic material, making them prime targets in the search for ancient chemical signatures.

Analysis suggests that the detected molecules may have originated from larger, macromolecular organic matter embedded in the rock, which was broken down during the experiment.

Implications for Future Missions

The success of the TMAH experiment marks a significant step forward in planetary science, demonstrating that more sophisticated chemical analyses can be performed directly on Mars.

Researchers say the results will help refine future missions, including upcoming instruments designed to search for biosignatures—chemical indicators of past or present life.

“This expands the known inventory of Martian organic chemistry,” scientists noted, adding that the diversity of molecules strengthens the case for continued exploration.

As Curiosity continues its journey across Gale Crater, the rover’s discoveries are steadily reshaping our understanding of Mars—not as a barren world, but as a planet with a complex and enduring chemical history.