NASA’s Perseverance rover has delivered a very intriguing finding – maybe the most interesting and reliable to date –  from Mars’ Jezero Crater. A new study published in Nature, with researchers from DTU Space as central contributors, reports that rocks in the so-called “Bright Angel” formation, located along Neretva Vallis, contain both organic matter and distinctive mineral structures that appear to have formed through redox reactions at low temperatures (Hurowitz et al., 2025). 

Perseverance deployed its advanced instrument suite — PIXL (Planetary Instrument for X-ray Lithochemistry), SHERLOC (Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals) with its context imager WATSON, SuperCam, Mastcam-Z, and RIMFAX (Radar Imager for Mars’ Subsurface Experiment). Together, these tools enabled detailed elemental mapping, organic detection, microscopic imaging, spectroscopy, high-resolution imaging, and subsurface radar probing. Their analyses revealed mudstones containing tiny nodules enriched in ferrous iron phosphates, such as vivianite, and iron sulphides, such as greigite. On Earth, such minerals often form through biologically mediated processes in watery environments, so their presence on Mars raises questions about whether similar mechanisms could once have operated there. The research suggests that these nodules and “reaction fronts” developed after the rocks were deposited, as chemical interactions between organic matter, iron, sulphur, and phosphorus reshaped the sediments. While abiotic explanations remain possible, the observed mineral–organic associations resemble patterns known from terrestrial settings where microbial life played a role. This does not prove that life existed on Mars, but it strengthens the case for Jezero Crater as an ancient habitable environment. 

Most importantly, Perseverance has cached a core sample from this formation—nicknamed “Sapphire Canyon”—for potential return to Earth. Future laboratory analyses will allow researchers to probe the origin of the minerals, organics, and textures with far greater precision than is possible on Mars. 

As highlighted by the BBC in their follow-up article (Therrien, 2025), these findings illustrate the mission’s central goal: to seek evidence of past life and to prepare the way for Mars Sample Return, one of the most ambitious space exploration projects ever attempted. For Aarhus University and the wider research community, they underline how international collaboration and scientific discovery bring us ever closer to answering the profound question: Was there ever life on Mars? Insights from this search may also help us address a similar question about our own origins and the history of life on Earth. 

References: 

Hurowitz, J. A., Tice, M. M., Allwood, A. C., Cable, M. L., Hand, K. P., Murphy, A. E., … Wolf, Z. U. (2025). Redox-driven mineral and organic associations in Jezero Crater, Mars. Nature, 645, 332–340. https://doi.org/10.1038/s41586-025-09413-0 

Therrien, A. (2025, September 12). Mars rover Perseverance finds new clues about possibility of ancient life. BBC News. https://www.bbc.com/news/articles/cd725pj0g9ro 

DTU Space Sep. 2025: DTU researchers are "closer than ever" to proving that there has been life on Mars