Ancient Martian Clay Reveals Long-Lived Organic Chemistry

In a 3.5-billion-year-old clay-rich rock from Gale Crater, Curiosity detected 21 carbon-based molecules, including a nitrogen-containing ring linked to prebiotic chemistry, demonstrating ancient Martian sediments can preserve complex organics for billions of years. Using the SAM instrument with a TMAH wet-chemistry method, seven molecules were confirmed as new detections on Mars, suggesting these organics may be fragments from larger material and highlighting preservation as a key story for future missions.