Mars Rock Reveals Complex Organics: Fresh Clues in Jezero Crater

NASA’s Perseverance rover detected macromolecular carbon (MMC), a complex organic matter, in two Bright Angel mudstones at Jezero crater using the SHERLOC instrument, marking the most robust organic signal there to date and the first MMC identified on Martian rock surfaces. While intriguing, MMC can form through both biological and non-biological processes, so this does not prove past life; definitive testing would require returning samples to Earth, a plan hampered by political issues. Curiosity has also found organics elsewhere on Mars, underscoring ongoing interest in whether ancient microbes once inhabited the planet.