NASA’s Curiosity rover identified more than 20 organic molecules in a rock sample collected in 2020. The detection occurred in an area called Mary Anning 3, within the Glen Torridon region, in the Gale crater. The Sample Analysis at Mars instrument, or SAM, performed the first wet chemistry experiment on Martian soil.
The results came out in a study published this week. The sample came from clayey sandstone formed about 3.5 billion years ago. Argilas preserve organic matter well in Terra. Cientistas used tetramethylammonium hydroxide, known as TMAH, to break down larger structures. The solvent allowed the release and identification of compounds that simple heating would not reveal.
Amostra vein from rock drilled in 2020 in Gale crater
Curiosity drilled three holes in the rock dubbed Mary Anning. The third sample, Mary Anning 3, delivered the greatest diversity of organic molecules ever recorded in Marte. The site was part of an ancient environment with lakes and rivers. The Knockfarrill Hill formation, of the Glen Torridon member, holds sediments from that time.
The rover collected the dust and sent it to the SAM laboratory, inside the vehicle. The instrument heated the material to 550 degrees Celsius. Parte’s analysis used evolved gas analysis and chromatography coupled to mass spectrometry. TMAH reacted with the sample and produced methylated derivatives. Isso released more than 20 compounds, including benzothiophene and methyl benzoate.
Sete molecules first appeared in Marte data. Entre they, a nitrogenous heterocycle, carbon ring structure with nitrogen. Esse type of compound is considered chemical precursor of RNA and DNA in Terra. The detection marked the first time something like this had been confirmed on the Martian surface or in Martian meteorites.
Wet Química allowed access to matter preserved for billions of years
The TMAH experiment was reserved for high-value samples. The rover takes only two doses of the reagent. Cientistas chose Mary Anning 3 carefully. Argila helps protect molecules against radiation and geological processes.
Amy Williams, of Universidade of Flórida, led the work. Ela stated that the team analyzes organic matter preserved for 3.5 billion years. The result provides evidence that ancient environments in Marte preserved organic carbon. Isso helps assess past habitability.
- The experiment used 25% TMAH in methanol.
- The reaction combined hydrolysis, thermal cleavage and methylation.
- Produtos included simple and bicyclic aromatic molecules.
- Compostos with sulfur, oxygen and nitrogen were released.
- Testes in laboratory with Murchison meteorite confirmed similar reactions.
The analysis took years because the data needed detailed processing on land. The study was published in the journal Nature Communications on April 21, 2026.
Nitrogenous Heterociclo sparks astrobiological interest
The nitrogenous heterocycle has a structure similar to nucleic acid precursors. Na Terra, compounds like this participate in the formation of RNA and DNA. Cientistas emphasize that presence does not prove life. Organic Moléculas may come from geological processes or delivery by meteorites.
Mesmo thus, the discovery reinforces that Marte has stored organic material for eons. Old Argilas acted as protective capsules. Gale crater has shown signs of liquid water in the past. Lagos and rivers existed there billions of years ago.
Outros detected compounds include naphthalene and molecules with ester and carboxylic acid functional groups. Alguns resemble products found in carbonaceous meteorites. The comparison suggests similar sources acted on both planets.
Instrumento SAM paves the way for future missions
The success of TMAH on Marte validates the technique for other robots. The Rosalind Franklin mission, from Agência Espacial Europeia, will carry similar equipment. Dragonfly, which goes to Titã, also foresees the use of TMAH.
Curiosity has remained active since 2012. The rover has already traveled more than 30 kilometers and climbed part of Monte Sharp. Previous SAM Dados detected chlorobenzene and other simple compounds. The new experiment expanded the catalog.
The team plans further analysis of stored samples. Outro test with TMAH has already taken place in a different location. Resultados ainda estão em processamento.
Descoberta strengthens search for signs of ancient habitability
Cientistas see the finding as a step towards understanding whether Marte had the conditions for microbial life. Organic Preservação is key piece. Samples from Retorno to Terra would allow for deeper analysis.
For now, the data shows that the planet has retained complex molecules despite intense radiation and diagenesis. Glen Torridon’s ancient environment appears conducive to preservation.
Curiosity continues to collect information. The original mission would last two years. Ela has been in operation for over 13 years. Cada new sample adds layers to the primitive Marte framework.
