NASA’s Curiosity rover detected decane, undecane and dodecane in a drilled mudstone sample from Gale crater. The finding shows that relatively large organic molecules can survive in ancient Martian rock; it does not show that life produced them.
Which molecules did Curiosity detect?
The compounds were decane (C10H22), undecane (C11H24) and dodecane (C12H26): alkanes with chains of 10, 11 and 12 carbon atoms, respectively. The 2025 study by Freissinet and colleagues reported that the Sample Analysis at Mars (SAM) instrument released and identified them at the tens-of-picomoles level in the Cumberland sample. [c001] [c002]
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Cumberland is a drilled mudstone that NASA describes as material from an ancient lake environment in Gale crater. Curiosity’s onboard SAM mini-laboratory analyzed the sample. [c002]
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How did SAM find them?
The team used a modified SAM analytical procedure optimized to detect larger organic molecules than the instrument’s usual analyses target. The reported result is the detection of the alkanes released from Cumberland by that procedure. [c001]
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Laboratory experiments support the possibility that the alkanes were originally preserved in the rock as long-chain carboxylic acids, which can yield alkanes under the analysis conditions. This is a supported precursor interpretation, not a direct detection of intact fatty acids in the original Martian sample. [c001] [c002]
Does the discovery mean Curiosity found life?
No. Organic molecules contain carbon, but their presence alone does not identify how they formed. The 2025 study leaves the origin uncertain, and NASA notes that relevant fatty-acid-like compounds can also form through non-biological geological processes, including water interacting with minerals in hydrothermal vents. [c001] [c002]
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What origins are still possible?
Biological accumulation
One possibility considered in a 2026 follow-up is that organic material accumulated through a hypothetical ancient Martian biosphere. The paper discusses this as a possible mechanism, not evidence that such a biosphere existed. [c003]
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Abiotic production or transport
Non-biological geological chemistry is also plausible. The 2026 follow-up considers transported hydrothermal organics as one possible mechanism; neither that pathway nor a biological source is established by the detection. [c002] [c003]
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The follow-up reports an abundance of 30–50 parts per billion (ppb) for the long-chain alkanes and possible carboxylic-acid precursors. Its authors estimate that the material may have been more abundant before roughly 80 million years of exposure to ionizing radiation. These are the follow-up’s abundance and exposure estimates, not direct evidence of the molecules’ source. [c003]
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why does the finding matter?
The result shows that larger organic molecules can be preserved in at least one ancient Martian mudstone sample and detected with a procedure designed to look for them. NASA’s Curiosity research summary says: “While there’s no way to confirm that these long-chain alkanes resulted from biology, finding them provides hope that other large organic molecules, and specifically those created only by life (so-called ‘biosignatures’), could be preserved in ancient rocks on Mars.” [c002]
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Distinguishing biological from abiotic origins would require evidence that can discriminate between those processes; these three molecules by themselves do not do so. The discovery therefore expands what scientists can look for in Martian rocks without settling whether life ever produced the material.
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