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Planetary Radio • May 20, 2026

Twenty organic molecules found in an ancient Martian rock

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On This Episode

Amy williams

Amy Williams

Associate Professor of Geological Sciences for University of Florida

Bruce betts portrait hq library

Bruce Betts

Chief Scientist / LightSail Program Manager for The Planetary Society

Sarah al ahmed headshot

Sarah Al-Ahmed

Planetary Radio Host and Producer for The Planetary Society

NASA's Curiosity rover has been exploring Mars' Gale Crater for over a decade. A new analysis of samples collected there reveals something remarkable: more than 20 different organic molecules preserved in ancient rock, including the first detection of a nitrogen-bearing heterocycle on Mars, a type of molecule that's a precursor to compounds essential for life as we know it.

While these molecules aren't evidence of life, they tell us that the chemical building blocks for life were present in ancient Martian environments. In this episode, we talk with Amy Williams, an astrobiologist and associate professor at the University of Florida, about what this discovery means for our understanding of Mars' habitability. Then, Planetary Society Chief Scientist Bruce Betts joins us for What's Up, where we compare the results to samples collected from asteroid Bennu.

Curiosity Selfie at Mary Anning
Curiosity Selfie at Mary Anning This selfie was created from 59 images captured by NASA's Mars Curiosity rover on 25 October 2020. The rover was stopped at a location named Mary Anning where scientists suspect conditions on Mars were once favorable for life. The site is named after a 19th-century English paleontologist whose discovery of marine-reptile fossils was ignored for generations because of her gender and class.The three small holes visible in the rock were drilled by Curiosity to collect samples that revealed more than 20 different organic molecules, including the first detection of a nitrogen-bearing heterocycle on Mars.Image: NASA/JPL-Caltech/MSSS
Mary Anning drill holes
Mary Anning drill holes A close-up view of the Mary Anning rock sample shows three drill holes made by Curiosity's rock drill. Each hole represents a separate sample collection at this site in Gale Crater's Glen Torridon region. The samples from these holes were analyzed using a specialized chemical experiment that revealed more than 20 different organic molecules on Mars.Image: NASA/JPL-Caltech/MSSS
A clay-bearing unit on Mars
A clay-bearing unit on Mars This mosaic captured by Curiosity's Mast Camera shows a clay-bearing unit in Gale Crater, including the rocky landmark nicknamed "Knockfarril Hill." This region was a scientific destination long before Curiosity launched, as orbiting spacecraft had detected a strong clay signature here, suggesting water once played a role in shaping it. It was within these ancient, water-influenced rocks that Curiosity would later collect samples revealing more than 20 organic molecules.Image: NASA/JPL-Caltech/MSSS

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