Mars sample yields more than 20 organic molecules

What the study found: The study reports the in situ detection of more than 20 organic molecules in clay-bearing sandstone from the ~3.5-billion-year-old Knockfarrill Hill member of Glen Torridon in Gale crater, Mars. The molecules were released by a tetramethylammonium hydroxide wet chemistry experiment on the Sample Analysis at Mars instrument suite aboard the Curiosity rover.
Why the authors say this matters: The authors conclude that the experiment successfully released molecules preserved in ancient macromolecular or free organic matter within Martian bedrock, despite about 3.5 billion years of diagenesis and radiation exposure.
What the researchers tested: The researchers used the Sample Analysis at Mars instrument suite onboard Curiosity to analyze clay-bearing sandstones in Gale crater. They applied the onboard tetramethylammonium hydroxide wet chemistry experiment and then detected products using evolved gas analysis and gas chromatography-mass spectrometry.
What worked and what didn't: The experiment released and detected diverse thermochemolysis products, including benzothiophene, methyl benzoate, and single and dicyclic aromatic molecules. The abstract describes this as a successful release of preserved organic material; it does not describe any failed measurements.
What to keep in mind: The abstract does not provide detailed limits, uncertainties, or controls beyond the stated sample type, location, and preservation context. It also does not describe how representative these molecules are of Mars more broadly.

Key points

• More than 20 organic molecules were detected in Martian clay-bearing sandstone.
• The sample came from the ~3.5-billion-year-old Knockfarrill Hill member in Gale crater.
• The molecules were released by a tetramethylammonium hydroxide wet chemistry experiment on Curiosity.
• Detected products included benzothiophene, methyl benzoate, and single and dicyclic aromatic molecules.
• The authors conclude the experiment released preserved organic matter despite long-term diagenesis and radiation exposure.