Overview
- Curiosity’s results, published Tuesday in Nature Communications, cataloged 21 carbon-bearing molecules with seven first-time detections on Mars, including a nitrogen heterocycle viewed as a chemical precursor to RNA and DNA.
- To reveal otherwise hidden compounds, the rover dissolved powdered rock in a solvent called TMAH inside its SAM lab, executing a rare wet-chemistry experiment using one of only two cups carried on board.
- The analyzed sample, a clay-rich sandstone called Mary Anning 3 drilled on Mount Sharp in 2020, likely preserved organics for roughly 3.5 billion years because clay minerals can trap and protect fragile molecules.
- Scientists say the molecules could come from geologic reactions or from meteorites rather than biology, and lab tests on the Murchison meteorite using the same solvent produced similar breakdown products.
- The technique will inform upcoming missions such as ESA’s Rosalind Franklin rover, while researchers argue that returning Mars samples to Earth remains crucial after recent setbacks to planned sample-return efforts.