Perseverance finds organic carbon in Jezero

NASA’s Perseverance rover has found widespread organic carbon in rocks inside Jezero Crater, according to a 2026 paper in *Science Advances*. The detections came from mudstones in an ancient river valley at a site called Bright Angel, where the rover used its SHERLOC Raman spectrometer to map carbon-bearing signals across natural rock surfaces. The authors said the measurements amount to the most robust organic detection yet made by Perseverance in Jezero. They also said the rover’s in-place instruments cannot determine whether the material came from biology or nonbiological chemistry. ### What, exactly, did Perseverance detect? The *Science Advances* paper reported a “heterogeneous distribution of organic carbon” within mudstones in an ancient river valley on Mars. The team said measurements from two mudstones produced “hundreds of organic detections,” making the result the strongest organic detection so far in Jezero Crater and, to the authors’ knowledge, the only detection of macromolecular carbon on a natural rock surface on Mars. (science.org) SHERLOC — short for Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals — made the detections on exposed rock at Bright Angel, according to NASA and JPL material tied to the rover’s 2024 campaign in the channel. NASA described Bright Angel as part of the ancient Neretva Vallis river channel, which fed Jezero Crater with fresh water billions of years ago. (science.org) ### Why are scientists focusing on Bright Angel? Bright Angel sits in a part of Jezero where water once moved through the crater, and Perseverance reached it during a route change that NASA said cut weeks off the drive. JPL said the detour also gave the science team access to “exciting geologic features” in an ancient river channel. (science.org) The 2026 paper said one rock’s interior showed organics associated with secondary carbonate and sulfate minerals, while another showed organics associated with a primary silicate-dominated matrix. That matters to the science team because the carbon signal appears in more than one mineral setting within the outcrop, according to the paper. ### Does this mean Perseverance found evidence of life? (jpl.nasa.gov) The authors of the paper said no such conclusion can be made from the rover’s in situ Raman measurements alone. They wrote that the analyses “cannot determine whether these organics denote abiotic or biotic sources,” even though the detections are widespread and tied to minerals linked to deposition and later alteration. (science.org) A separate 2025 NASA release on another Jezero sample, Cheyava Falls, used similar caution. NASA said that sample contained a “potential biosignature” and could preserve evidence of ancient microbial life, but the agency did not say it was proof of life. JPL material on Bright Angel also noted that one target there later became linked to that potential biosignature work. (science.org) ### How does this fit with earlier Mars organic detections? Mars missions have detected organic molecules before, but the new paper describes a broader mapped distribution in Jezero outcrop rock. The study said the Bright Angel detections are the most robust in Jezero so far, and the authors said the signals suggest organics there may either resist radiation and oxidation or have been exposed relatively recently. That interpretation came from the paper’s authors, not from NASA news copy. (nasa.gov) A 2025 *Nature Astronomy* paper also reported polycyclic aromatic hydrocarbons preserved within sulfates in Jezero crater, adding to evidence that organic compounds can survive in Martian rocks. Together, those findings show Perseverance has been detecting carbon-bearing chemistry in several Jezero settings. ### What happens next with these rocks? NASA’s Mars 2020 mission page says Perseverance is searching for signs of ancient life while collecting rock and regolith samples for possible return to Earth. (science.org) The rover remains active on Mars, and NASA’s public location page lists its latest drive status and traverse through Jezero Crater. Any stronger claim about the origin of the carbon will depend on additional rover measurements and, if sample return proceeds, laboratory analysis on Earth by named mission scientists and partner institutions. (nature.com) The current paper establishes where the carbon was found and how broadly it is distributed in the Bright Angel mudstones. (science.org) (mars.nasa.gov)