NASA's Curiosity rover has found organic molecules on Mars that may be billions of years old

NASA's Curiosity rover has found organic molecules on Mars that may be billions of years old — and the scientists studying them are being careful about what they say next. Thirteen years after landing in Gale Crater, NASA's Curiosity rover has produced what may be its most significant scientific result to date.

Thirteen years after landing in Gale Crater, NASA’s Curiosity rover has produced what may be its most significant scientific result to date. In a paper published in Nature Communications in April 2026, researchers led by Amy Williams, an astrobiologist and professor of geological sciences at the University of Florida, reported the detection of more than 20 organic molecules in a single Martian rock sample — the most diverse collection ever found on the planet. Seven of the molecules had never been confirmed on Mars before.

The findings have generated substantial coverage, most of it accurate. Some of it has also required the scientists involved to do something that researchers in this field have learned to do carefully: explain, repeatedly and in precise terms, what the discovery does and does not mean.

The experiment at the centre of the April findings used a chemical called tetramethylammonium hydroxide, or TMAH — a solvent capable of breaking apart large organic molecules into smaller fragments that Curiosity’s onboard instruments can then identify. The rover carries only two cups of this chemical. The decision about where to use the first cup was not made lightly.

The chosen sample, drilled from a site the team named Mary Anning 3 — after the 19th-century British paleontologist who spent her career finding fossils others had overlooked — came from the Glen Torridon region of Gale Crater, an ancient clay-rich area that scientists believe once held standing water. The clay minerals there are known to preserve organic material over geological timescales. The sample itself is estimated to be approximately 3.5 billion years old.

“This experiment’s never been run before on another world,” Williams told AFP. The team had two chances to get it right. They used the first one here.

https://spacedaily.com/n-nasas-curiosity-rover-has-found-organic-molecules-on-mars-that-may-be-billions-of-years-old-and-the-scientists-studying-them-are-being-careful-about-what-they-say-next

This material may be lost forever because in Jan. 2026, the rethuglican Congress canceled Mars Sample Return program.