Murchison Meteorite Study Recasts 2 Mars Biosignatures as Petroleum Contamination
Updated
Updated · The Brighter Side of News · Jun 21
Murchison Meteorite Study Recasts 2 Mars Biosignatures as Petroleum Contamination
3 articles · Updated · The Brighter Side of News · Jun 21
Summary
Guillaume Leseigneur's team found pristane and phytane in the Murchison meteorite match terrestrial petroleum contamination, not biological traces that could support a Martian-life interpretation.
Chiral analysis showed all mirror-image variants in roughly equal proportions, a racemic pattern inconsistent with fresh biomass but consistent with mature oil altered by heat and pressure over time.
Using replicas of ExoMars' MOMA chromatographic tubes, the researchers said they achieved the first chiral separation of pristane and phytane with the same setup planned for Rosalind Franklin's Mars mission.
The team argues the compounds likely settled onto the meteorite after its 1969 fall through fossil-fuel-derived aerosols, underscoring how quickly exposed space rocks can pick up Earth contamination.
For Mars exploration, the result narrows the standard for claiming life: detecting the molecules alone will not suffice when Rosalind Franklin begins searching for organics in 2030.