Curiosity Finds Seven New Organic Molecules on Mars
Scientists identified 21 carbon-containing molecules in a rock sample, seven of them never before detected on the Red Planet.
Updated on Nov. 4, 2026 in Geology
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NASA's Curiosity rover analyzed the Mary Anning 3 rock sample, drilled in October 2020, and identified 21 carbon-containing molecules, seven of which had never been detected on Mars. The findings were published in Nature Communications.
Why it matters
The discovery includes a nitrogen heterocycle, a ring of carbon atoms containing nitrogen, which had never been found on the Martian surface or confirmed in Martian meteorites. Such organic compounds help researchers understand whether the chemistry needed for life has existed on Mars.
The Mary Anning 3 sample was analyzed using a high-temperature oven and a solvent-based wet chemistry technique, with the solvent tested first on a Murchison meteorite older than 4 billion years. Researchers have not yet confirmed whether the molecules formed from the breakdown of more complex compounds, a question left for future analysis.
The players
NASA Goddard
NASA's Goddard Space Flight Center in Greenbelt, Maryland, built instruments including a mass spectrometer used in Mars organic chemistry missions.
Curiosity rover
NASA's Mars rover that has been exploring Gale Crater and Mount Sharp since 2012, carrying the Sample Analysis at Mars laboratory.
The details
A drill on Curiosity's robotic arm pulverized rock from a region of Mount Sharp that lakes and streams covered billions of years ago, and the powder was fed into the rover's laboratory. Clay minerals in the area are known to preserve organic compounds, and the sample also contained benzothiophene, which includes carbon and sulfur.
Timeline
October 2020: Curiosity drilled the Mary Anning 3 rock sample.
Last year: The laboratory discovered the largest Martian organic molecules, long-chain hydrocarbons.
2026: Results were published in Nature Communications.
The Big Picture
The findings build on the decades-long search for organic molecules on Mars that began with the 1976 Viking lander experiments, which could not identify specific compounds. Curiosity's laboratory now detects molecules that earlier instruments missed, shifting the question from whether Mars held organics to how they formed and persisted.
Organic molecules on Mars are a key input for future missions seeking biosignatures, and instruments such as the Mars Organic Molecular Analyser on the European Space Agency's Rosalind Franklin rover are being built to continue this work. The techniques tested here will shape which samples future rovers choose to analyze.
The takeaway
The Curiosity findings show that Mars has preserved a wider range of carbon compounds than previously confirmed, which narrows the search for evidence of past habitability. Future rover missions will need to test similar chemistry to determine how these molecules formed.
Further reading
For background on how rock layers record Mars's past, explore our Geology coverage.
Source note: This article includes information reported by The Times of India.
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