Note: Single-source report; awaiting corroboration.
NASA’s Curiosity rover drilled and analyzed a rock sample called "Mary Anning 3" in 2020, uncovering the most diverse collection of organic molecules yet identified on Mars. Among 21 carbon-containing molecules, seven were detected on the planet for the first time, according to NASA.
The sample was collected from Mount Sharp, an area once covered by lakes and streams billions of years ago. This environment led to the enrichment of clay minerals, which help preserve organic compounds despite Mars' radiation over time.
One notable molecule discovered is a nitrogen heterocycle—a ring of carbon atoms including nitrogen—which is considered a chemical precursor to nucleic acids like RNA and DNA. Lead author Amy Williams of the University of Florida noted that nitrogen heterocycles have not been previously found or confirmed on Mars or in Martian meteorites. Another distinct molecule is benzothiophene, containing carbon and sulfur, similar to compounds found in meteorites that may have contributed to prebiotic chemistry in the early solar system.
These findings complement last year’s identification of large organic molecules on Mars, including long-chain hydrocarbons such as decane, undecane, and dodecane. Ashwin Vasavada, project scientist for the mission at NASA’s Jet Propulsion Laboratory, stated that these discoveries enhance the prospect that ancient Mars had conditions that could have supported life.