Perseverance Finds Organic Carbon in Mars “Leopard Spots” as Nature Paper Flags Potential Biosignatures
Updated
Updated · spacedaily.com · Jun 28
Perseverance Finds Organic Carbon in Mars “Leopard Spots” as Nature Paper Flags Potential Biosignatures
3 articles · Updated · spacedaily.com · Jun 28
Summary
Cheyava Falls, a mudstone drilled in Jezero Crater’s ancient river channel, yielded a cached core where organic carbon sits alongside iron-rich “leopard spot” and “poppy seed” mineral features.
Nature reports those features include iron phosphate vivianite and iron sulfide greigite in clay and silt deposits—an association that on Earth can accompany microbial redox activity in oxygen-poor sediments.
NASA and the paper’s authors stress the result is only a potential biosignature: organic carbon, sulfur and iron minerals can all form without life, and Perseverance cannot run the full isotopic and microscopic tests needed to rule that out.
The finding builds on earlier Bright Angel detections of unusually abundant macromolecular carbon and sharpens Jezero’s appeal as a once-wet environment where returned samples such as Sapphire Canyon could be tested in Earth labs.
Why do clues from Mars' Jezero crater look so much like ancient life, yet scientists still can't be sure?
As NASA's sample return mission faces delays, could China's 2031 mission be first to answer if Mars ever hosted life?
NASA’s Perseverance Uncovers Macromolecular Carbon in Jezero Crater: A Major Leap Toward Proving Ancient Life on Mars
Overview
NASA's Perseverance rover has made a groundbreaking discovery by detecting complex carbon molecules, known as macromolecular carbon (MMC), in Martian mudstones at Jezero Crater's Bright Angel outcrop. While scientists already suspected Jezero Crater once held water, finding MMC on the rock surface in this way is unprecedented. MMC is important because it forms much of both fossilized biological carbon on Earth and nonbiological carbon in the solar system. Its unusual resistance suggests it could be preserved for billions of years, making this discovery a major step forward in understanding Mars' potential for ancient habitability.